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The Long and Short-term Determinants of Inflation in Indonesia’s Regions
Donni Fajar Anugrah1
Abstract
Although inflation rate was down from 6.96% in 2010 to 3.79% in 2011, the
average inflation in Indonesia has been relatively high since 1998. The high and persistent
inflation recently becomes important issues for both central bank and Indonesia
government. Therefore, the controlling inflation is a key policy concern in Indonesia.
However, this is a difficult task due to differences across regions. Since each region has
specific characteristics, determinants of inflation may be different in each region.
This research aims to analyze the factors of inflation in the long-term and short-
term. The result will be important to understand the differences between long-term and
short-term factors of inflation among regions. This study develops the long-term and short-
term models of inflation by applying panel co-integration techniques (Smith and Pesaran,
1995; Im, Pesaran and Shin, 1997; Breitung 2001; Breitung and Pesaran 2005). It also
applies an extended Engle Granger method of error correction mechanism (ECM). This
study extends previous research approaches (Leheyda, 2005) which applied Johansen’s
procedure and based on purchasing power parity theory. The model will be classified in
five regions: Sumatra, Java, Kalimantan, Sulawesi and Papua. Cross section data are
Indonesia’s provinces in each region and time series is over the period 1989-2010. Data
are provided by Statistic Bureau of Indonesia and Bank Indonesia.
The empirical results report that inflation in each region has been determined by
similar factors which are foreign price and exchange rate in the long term. These findings
confirm previous studies found that both foreign price and exchange rate have long-term
effects on domestic prices (e.g. Listiani, 2006; Endri, 2008; Kandil and Morsy, 2009; Khan
and Gill, 2010). The effects of both factors are different in each region which the highest
effect of foreign price to inflation is in Sumatra and the highest effect of exchange rate to
inflation is in Sulawesi. In the short term, the factors of inflation are different in each
region. They are wage, total factor productivity (TFP), money supply, interest rate and the
price of kerosene.
Keywords : inflation rate, regional economics, panel co-integration JEL : E31, R11, C33
1 Donni Fajar Anugrah is currently a PhD student in Economics at The University of Western Australia. His
study has been sponsored by Bank Indonesia as his employer. He has been working as an economist at Bank Indonesia since 1999.
Page 1
The Long and Short-term Determinants of Inflation in Indonesia’s Regions
1. Introduction
Since the Act No.23 about Bank Indonesia independence was issued in 1999 and
renewed in 2003 by the Act No.4, the main goal of Bank Indonesia as central bank of
Indonesia is to achieve a low and stable inflation. Bank Indonesia has applied Inflation
Targeting Framework (ITF) policy to achieve their goal. The high and persistent inflation
recently becomes important issues for both central bank and Indonesia government.
Controlling inflation is a key policy concern in Indonesia. However, this is a difficult task
due to differences across regions. Since each region has specific characteristics, the
determinants of inflation may be different in each region.
There are limited studies that examined the determinants of regional inflation in
Indonesia (Wimanda 2006; Anugrah, Dewati & Chawwa 2007). Wimanda (2006) found
that the main factors of inflation in all provinces in Indonesia are expected inflation and
exchange rate. Similarly, another study (Anugrah, Dewati and Chawwa, 2007) found that
factors of inflation in East Java, Central Java, Yogyakarta and Bali are expected inflation,
exchange rate and output gap. However, their studies fail to address the issue of differential
factors contributing for inflation in province in the long and short-term. Moreover, none of
these studies analyzed regional differences across Indonesia applying panel data co-
integration techniques.
These issues raise an important and related question which will be addressed in this
chapter: What are the long and short-term determinants of inflation in Indonesia’s regions?
The main focus of this thesis is to analyze the determinants of inflation in the long and
short-term. The result will be important to understand the differences long and short-term
factor of inflation among regions. Therefore, policy makers can issue their policies by
considering those factors in each region.
This study will use different methods, to address the different objectives and
specific topics. Developing long and short-term models of inflation by applying panel co-
integration techniques (Smith & Pesaran 1995; Im, Pesaran & Shin 1997; Breitung 2001;
Breitung & Pesaran 2005) using an extended Engle Granger method of error correction
mechanism (ECM). This study will build on previous research approaches (Leheyda, 2005)
Page 2
which applied Johansen’s procedure with VAR and based on purchasing power parity
theory. This chapter will focus on Indonesia’s regions which have not been studied yet.
This chapter is structured as follows. Section 2 presents the study literature related
with determinants of inflation. Section 3 presents data, methodology and econometric
models. Section 4 reports and discusses empirical results. The last part presents our main
conclusion and policy recommendation.
2. Literature Review
Inflation which generally means an increase in price can be determined by the long
and short term factors. In the long run, price can be influenced by changes in aggregate
demand and/or aggregate supply. Romer (2001) mentioned that technology shock and labor
supply can be as sources of inflation in aggregate supply side. Meanwhile money stock and
money demand can influence aggregate demand. He also stated that money supply growth
can be the main factor of inflation in the long term. The formula of demand for real money
is below:
( , )M
L i YP
Noted: M is money stock, P is price level, i is nominal interest rate, and Y is real
income.
Since nominal interest rate can influence price level and policy rate directly
influence interest rate, policy rate can be the factor of inflation rate. When policy rate goes
up or monetary policy tightening, domestic prices can be going down. An increase in policy
rate is followed by reducing consumption or shifting aggregate demand to the left.
Therefore, inflation goes down as a response of monetary tightening.
The monetary explanation for inflation has dominated the literature since the late
1970s. This theory suggests that money growth determines inflation, and that there is a
strong link between money growth and inflation (Friedman & Schwartz 1982). A number
of studies have confirmed Friedman’s analysis to argue that money growth is positively
linked to inflation in some countries, see for example studies from Australia (Fahrer &
Myatt 1991), Nigeria (Moser 1995), Albania (Domac & Elbrit 1998), Indonesia (Listiani
2006), Paraguay (Monfort & Pena 2008) and Tunisia (Boujelbene & Boujelbene 2010).
Page 3
Another important factor of inflation is exchange rate which can influence prices in
the short and long term. Some studies (e.g. Nicolae, 2002; Listiani, 2006; Endri, 2008;
Gachet, Maldonado and Perez, 2008; Kandil and Morsy, 2009; Khan and Gill, 2010) found
that depreciation of exchange rate can increase inflation. Indeed, Indonesian study (Siregar
& Rajaguru 2002) found that the main factors of inflation in Indonesia are base money and
exchange rate during the post Asian financial crisis period (1997). The role of exchange
rate can be explained by the theory of purchasing power parity. This theory suggests that
domestic prices are influenced by both foreign prices and the exchange rate (Hallwood &
MacDonald 2000). The formula of purchasing power parity is below:
*P SP
Noted: P is the domestic price, S is exchange rate, and *P is foreign price.
As foreign prices are positively correlated with domestic prices, an increase in
foreign prices can lead to an increase in domestic prices. Leheyda’s (2005) study from
Ukraine confirms this since the foreign prices were found to have long-term effects on
domestic prices. Meanwhile, depreciation of exchange rate can increase domestic prices.
The foreign exchange rate is regarded as a particularly important factor influencing
inflation in the long and short-term. Recent evidence suggests that exchange rate
depreciation is found to generate inflation, due to an increase in imported product prices
(e.g. Domac and Elbirt, 1998; Dlamini, Dlamini and Nxumado, 2001; Nicolae, 2002;
Listiani, 2006; Endri, 2008; Gachet, Maldonado and Perez, 2008; Kandil and Morsy, 2009;
Khan and Gill, 2010).
In the short term, the sources of inflation can be more factors than in the long term.
The popular theory of the long term factors of inflation is Philips Curve theory. This theory
argued that the main factors influencing inflation are expected inflation, output gap and
supply shock. The assumption that individual’s expectations of future inflation are based on
recent inflation is known as adaptive expectations. Monfort and Pena (2008) showed that
inflation expectation was an important factor explaining the inflation trends in Paraguay.
An increase in output gap is positively related to inflation across European countries
(Boschi & Girardi 2007; Andersson, Masuch & Schiffbauer 2009). Other explanations
include supply shocks due to exogenous events, such as an increase in oil price (Mankiw,
2007). Another important factor of inflation is wage. An increase in wage can raise
domestic prices, because aggregate demand shifts to the right. On contrary, a decrease in
Page 4
wage can decrease domestic prices. Inflation study in Swaziland (Dlamini, Dlamini &
Nxumado 2001) found that wage is source of inflation in the long and short term.
3. Data and Methodology
3.1 Data
The data which are used by this study are from Statistic Bureau of Indonesia, Bank
Indonesia, and CEIC data. The data cover the 26 provinces of total 33 provinces in
Indonesia. The other seven provinces which have limited data are Bangka Belitung, Riau
Islands, Banten, Gorontalo, West Sulawesi, North Maluku and West Papua. Provinces in
Indonesia can be classified by five regions based on location. They are Sumatra, Java,
Kalimantan, Sulawesi and Papua. The data frequencies are annual data over the 1989-2010
period and monthly data over the 1993-2010 period.
Those data are consumer price index (CPI), exchange rate (Indonesia Rupiah agains
US dollar), the consumer price index (CPI) of US, money supply (broad money), wage,
TFP (Total Factor Productivity), oil price (kerosene price), expected inflation and policy
rate (Bank Indonesia rate). Data of money supply in each province are calculated by
proportion of province’s GDP to national GDP. This method is used by previous research
(Laksono 2005). Meanwhile, for expected inflation variable, we use the lag of inflation as
adaptive inflation (Mankiw 2007). Author obtains data of TFP by developing Solow
growth model and calculating TFP by growth accounting method (Tjahjono & Anugrah
2006).
Table 1. The List of Data
No Data Code Definition
1 CPI Consumer Price Index*
2 CPI US US Consumer Price Index***
3 ER Exchange Rate**
4 M2 Money Supply (broad money)
5 W Wage*
6 TFP Total Factor Productivity
7 Krs Price of Oil (Kerosene)***
8 CPI (lag) Expected Inflation
9 IP Policy Rate (Bank Indonesia rate)**
Sources: *Statistic Bureau of Indonesia, **Bank Indonesia and ***CEIC
Page 5
3.2 Methodology
This paper applied econometric approach which mainly applies error correction
mechanism (ECM). In the region cases, we applied co-integration techniques using panel
data (Breitung and Pesaran, 2005) to find the long-term factors of inflation. We develop 5
panel data sets with provinces in each region as cross-section data and over the period 1989
to 2010 as time series. Meanwhile, in the province cases, this study applied co-integration
techniques using time series (Granger & Engle 1987). We also develop 26 models of each
province in the long and short term with monthly data from 1993 to 2010.
The long run models must be tested whether they have co-integration in the long
term or not. If they pass the stationary test, it means the long term relationship exists.
Therefore, the residual of the long run model can be used as ECM. The function of ECM
on the short-term model is to keep the short run model in the equilibrium of the long run
model (Granger & Engle 1987; Katarina & Johansen 1994).
The economic models of inflation are classified by panel data for regional models
and time series data for provincial models. The regional models are in the long and short-
term. The long-term equation based on purchasing power parity theory (equation 1) and
modified by adding money supply (equation 3).
1 2 3log( ) log( ) log( *)ij ij ij ijP er P e (1)
where j is time index, ijP is the domestic price in province i , er is the exchange rate in
province i and *P is the foreign price in province i . Furthermore, we find ECM variable
by reformulating equation 1 to be equation 2:
1 2 3log( ) log( ) log( *)ij ij ij ijecm P er P (2)
The alternative model of the long-term equation is put money supply as long and
short-term factor based on quantity theory of money:
1 2 3 4log( ) log( ) log( *) log( *)ij ij ij ij ijP er P M e (3)
Page 6
where j is time index, ijP is the domestic price in province i , er is the exchange rate in
province i , *P is the foreign price in province i and M is the broad money in province
i . Furthermore, we find ECM variable by reformulating equation 3 to be equation 4:
1 2 3 4log( ) log( ) log( *) log( )ij ij ij ij ijecm P er P M (4)
For long-term model procedure, we do panel unit root test for ECM variable. If it
has no unit root, we put it in the short-term equation. The short-term equation:
, 1 , , ,
0 0 0
log( ) log( *) log( ) log( )k k k
ij i j t i j t t i j t t i j t
t t t
P ecm P er TFP
, ,
0 0
... log( ) log( )k k
t i j t t i j t ij
t t
Krs W
0,1,2....t k (5)
where j is time index, t is time lag, ,log( )i jP is price changes (inflation) in province i ,
,log( )i jer is exchange rate changes in province i , ,log( *)i jP is foreign price changes in
province i , ,log( )i jTFP is Total Factor Productivity in province i , ,log( )i jW is wage
changes in province i , ,log( )i jKrs is kerosene price changes in province i
Similarly, inflation models for provincial monthly data are in the long and short-
term. The long-term equation based on purchasing power parity theory (equation 6).
1 2 3log( ) log( ) log( *)t t t tP er P e (6)
where t is time index, tP is the domestic price, er is the exchange rate and *P is the
foreign price. Furthermore, we find ECM variable by reformulating equation 6 to be
equation 7:
1 2 3log( ) log( ) log( *)t t t tecm P er P (7)
Page 7
Furthermore, we do unit root test for ECM variable. If it has no unit root, it means
that the long-term model exists. Therefore, we put ECM variable in the short-term
equation. The formula of the short-term equation:
1
1 0 0
log( ) log( ) log( ) log( *)k k k
t t t t i t t i t t i
i i i
P ecm P er P
0 0 0 0
... log( ) log( ) ( ) log( )k k k k
t t i t t i t P t i t t i t
i i i i
M W i Krs
0,1,2....i k (8)
where t is time index, i is time lag, log( )tP is price changes (inflation), log( )t iP is
expected inflation changes, log( )ter is exchange rate changes, log( *)tP is foreign price
changes, log( )tM is money supply changes, log( )tW is wage changes, ( )P ti is policy
rate (Bank Indonesia rate) changes and log( )tKrs is kerosene price changes.
4. Empirical Results
In this part, we begin with the unit root test of the data in both regions and
provinces to find the order of integration in each data. We applied panel unit root test in the
regional cases and time series unit root test in the provincial cases. Furthermore, we
develop the long term model based on the variables which have the similar order of
integration. We get the ECM from the long term model and applied it in the short term
model.
4.1 The Order of Integration
Empirical results of panel unit root test indicate that CPI province in all regions is
unit root at level (Table 2). Different result is found by Breitung’s method that CPI
province is stationary at level in Kalimantan and Papua. However, other methods found
that the data are unit root at level in both regions. Table 2 also reports that CPI province is
not unit root at first difference in all regions. This results mean that order of integration of
CPI province in all provinces is one due to the data is stationary at first difference.
Page 8
Table 2. Panel Unit Root Test of CPI Province
Method Sumatra Java Kalimantan Sulawesi Papua
Level 1st Diff Level 1st Diff Level 1st Diff Level 1st Diff Level 1st Diff
Breitung
t-stat
-1.55 -8.59
***
-0.78 -6.49
***
-1.80
**
-5.66
***
-0.54 -4.24
***
-1.97
**
-5.89
***
Im, Pesaran
and Shin W-
stat
10.85 -8.38
***
10.85 -7.32
***
8.05 -5.63
***
7.36 -5.75
***
9.47 -5.62
***
ADF - Fisher
Chi-square
0.01 89.94
***
0.01 62.61
***
0.002 42.62
***
0.01 43.58
***
0.004 47.52
***
Observation 176 110 88 88 110
Notes: Significant 1% denoted by ***, 5% denoted by **, 10% denoted by *
The data of CPI US as representative of foreign price are not stationary at level by
three methods which are Im, Pesaran and Shin, ADF and PP methods. Meanwhile, other
two methods found different results (Table 3). When we put the data at first difference, we
found that all methods found the similar results (Table 3). Foreign price (CPI US) is
stationary at first difference in all regions. It means that order of integration of CPI US is
one.
Table 3. Panel Unit Root Test of CPI US
Method Sumatra Java Kalimantan Sulawesi Papua
Level 1st Diff Level 1st Diff Level 1st Diff Level 1st Diff Level 1st Diff
Breitung
t-stat
-2.31
**
-15.91
***
-
1.83**
-12.58
***
-1.64
*
-11.25
***
-
1.64*
-11.25
***
-1.83
**
-12.58
***
Im, Pesaran
and Shin
W-stat
1.42 -18.95
***
1.12 -14.98
***
1.00 -13.40
***
1.00 -13.40
***
1.12 -14.98
***
ADF -
Fisher Chi-
square
5.27 211.95
***
3.30 132.47
***
2.64 105.97
***
2.64 105.97
***
3.30 132.47
***
Observation 176 110 88 88 110
Notes: Significant 1% denoted by ***, 5% denoted by **, 10% denoted by *
Page 9
Similarly, the results of panel unit root test of exchange rate at level indicate that
exchange rate is unit root in all regions. Levin, Lin and Chu’s method found exchange rate
in Sumatra is significant at 10%. It means that exchange rate in Sumatra is not unit root at
level. However, by other methods we found that all regions are not significant meaning
data are not stationary at level (Table 4). At first difference, the data of exchange rate are
stationary in all regions. Table 4 reports that all regions are significant at 1%. Therefore,
the order of integration of exchange rate is one in all regions.
Table 4. Panel Unit Root Test of Exchange Rate
Method Sumatra Java Kalimantan Sulawesi Papua
Level 1st Diff Level 1st Diff Level 1st Diff Level 1st Diff Level 1st Diff
Breitung
t-stat
0.91 -13.81
***
0.72 -10.92
***
0.64 -9.77
***
0.64 -9.77
***
0.72 -10.92
***
Im, Pesaran
and Shin
W-stat
0.83 -13.12
***
0.65 -10.37
***
0.58 -9.28
***
0.58 -9.28
***
0.65 -10.37
***
ADF -
Fisher Chi-
square
7.36 147.37
***
4.60 92.10
***
3.68 73.68
***
3.68 73.68
***
4.60 92.10
***
Observation 176 110 88 88 110
Notes: Significant 1% denoted by ***, 5% denoted by **, 10% denoted by *
Table 5 reports that variables of money supply at level in all regions are not
significant. These results mean that money supply is unit root at level. Therefore, we
continue to test the variable of money supply at first difference. At first difference, the data
of money supply are stationary in all regions with Breitung t-stat method (Table 5). It
means that the order of integration of money supply is one in all regions.
Table 5. Panel Unit Root Test of Money Supply
Method Sumatra Java Kalimantan Sulawesi Papua
Level 1st Diff Level 1st Diff Level 1st Diff Level 1st Diff Level 1st Diff
Breitung
t-stat
14.61 -5.29
***
14.43 -4.11
***
11.11 -3.64
***
14.02 -3.54
***
9.49 -4.10
***
Page 10
Im, Pesaran
and Shin
W-stat
10.01 2.37 11.07 3.92 8.08 2.04 11.28 4.39 5.88 -1.66
**
ADF -
Fisher Chi-
square
2.51 15.31 0.0002 0.64 0.01 2.58 0.0001 0.23 1.91 35.99
***
Observation 176 110 88 88 110
Notes: Significant 1% denoted by ***, 5% denoted by **, 10% denoted by *
Similarly, we do unit root test for monthly data which is from 1993 to 2010 for 26
provinces. The data are domestic price (CPI), foreign price (CPI US) and exchange rate.
The results report that those variables are not stationary at the level. At the first difference,
they significantly reject unit root. It means the data are stationary. Therefore, we can
conclude that the data have order of integration at one.
4.2 Long-term Determinant of Inflation
Since the empirical results found that domestic price, foreign price, exchange rate
and money supply are stationary at the first difference. It means the data have the similar
level of order of integration which is one. Therefore, we can use the data in the long run
model. The results of panel OLS for domestic price (CPI province) can be seen on Table 6.
In the long run, the foreign price which is represented by CPI US has positively affected
domestic price which is represented by CPI province. The effect of CPI US in all regions is
different. The highest effect of foreign price is in Sumatra and the lowest effect of that is in
Java. The elasticity of foreign price in Sumatra and Java are 4.28 and 1.81 respectively. It
means an increase price in foreign price by 1% can increase domestic price by 4.28% in
Sumatra and by 1.81% in Java.
Meanwhile, exchange rate represented by US Dollar against Indonesia Rupiah is
positively associated with domestic price. Empirical results found that exchange rate is
significant and positive with elasticity by 0.49 in Sulawesi and 0.25 in Kalimantan. It
means depreciation of exchange rate by 1% can increase domestic price by 0.49% in
Sulawesi and by 0.25% in Kalimantan. This finding was supported by the fact that demand
of import in Indonesia is high. The high value of import explains that foreign price and
exchange rate are the main factor of domestic inflation. The domestic price can be
Page 11
determined by foreign price because the import value is high. Therefore, the domestic price
is sensitive to the foreign price. Meanwhile, depreciating exchange rate will be followed by
increasing domestic price.
Table 6. The Long-term Model (Panel Fixed Effect-Period)
Variable Sumatra Java Kalimantan Sulawesi Papua
CPI US 4.28
(0.16)***
1.81
(0.54)***
2.06
(0.56)***
4.08
(0.23)***
3.96
(0.19)***
ER 0.45
(0.02)***
0.27
(0.05)***
0.25
(0.06)***
0.49
(0.03)***
0.43
(0.03)***
M2 0.32
(0.08)***
0.29
(0.08)***
C -20.92
(0.64)***
-10.47
(2.17)***
-10.76
(2.48)***
-20.30
(0.90)***
-19.15
(0.64)***
R2 0.98 0.99 0.99 0.98 0.98
Observation 176 110 88 88 110
Provinces 8 5 4 4 5
Notes: standard errors are shown below the parameter estimates
Significant 1% denoted by ***, 5% denoted by **, 10% denoted by *
Money supply represented by broad money (M2) is positively associated with
domestic price. Empirical results found that money supply is only significant and positive
in Java and Kalimantan. The elasticity of money supply in Java and Kalimantan is 0.32 and
0.29 respectively. It means an increase of money supply by 1% can increase domestic price
by 0.32% in Java and by 0.29% in Kalimantan. The role of money supply in both regions is
important which is comparing to other inflation factors.
To prove that the long run model is robust, we do panel unit root test for the
residual of the long run model (Table 7). The empirical results found that the residual in all
regions are significant at 1%. Therefore, we can conclude that the long run model is valid.
Furthermore, we can use the error terms of those long-term models as error correction
mechanism (ECM) in the short-term models.
Table 7. Panel Unit Root Test of Residual at Level
Method Sumatra Java Kalimantan Sulawesi Papua
Levin, Lin & Chu t -5.85*** -5.48*** -5.28*** -4.98*** -6.73***
Breitung t-stat -3.12*** -4.22*** -4.46*** -2.93*** -5.12***
Page 12
ADF - Fisher Chi-square 56.37*** 42.85*** 37.41*** 39.25*** 60.89***
Notes: Significant 1% denoted by ***, 5% denoted by **, 10% denoted by *
In the provincial case we found that the order of integration of domestic price,
foreign price and exchange rate is one. Therefore, we those variables can be used in the
long run regression. The empirical results of OLS for domestic price in each province can
be seen in appendix. The results shows that the foreign price has positively affected
domestic price in the long term. However, the impact of CPI US on domestic price in each
province is various. The highest effect of foreign price is in Banda Aceh (6.06).
Meanwhile, the lowest effect of that is in Gorontalo (3.34). It means an increase price in
foreign price by 1% can increase domestic price by 6.06% in Banda Aceh and by 3.34% in
Gorontalo.
Similarly, the exchange rate is significantly affecting domestic price. The effect is
positive meaning that depreciation of Indonesian Rupiah against US Dollar can increase the
domestic price. The highest effect is in North Maluku with elasticity by 0.50 and the lowest
is in Papua with elasticity by 0.29. This finding confirms that exchange rate is the
important factor of inflation (Kandil & Morsy 2009; Khan & Gill 2010). The test results for
the error of the long term model in each province has significantly rejected that it has unit
root. Therefore, the long term model exists in all provinces. Thus, the error of those long
term models can be applied as ECM in the short term models.
4.3 Short-term Determinant of Inflation
In the short-term inflation model, we put ECM variable that we got from the long-
term inflation model. The ECM variable in each equation is expected to be negative, since
the role of ECM is to restore the equilibrium (Gujarati 2003). The empirical results show
that ECM variable is negative as expected in all equations (Table 9). The coefficient of
ECM in Sumatra, Java, Kalimantan, Sulawesi and Papua is -0.10, -0.11, -0.15, -0.13 and -
0.10 respectively.
In Sumatra, USCPI as representative of the inflation in US has positively affected
inflation in Sumatra and Kalimantan with one lag. The elasticity of US inflation is 0.36 in
Sumatra and 0.22 in Kalimantan. Those mean that an increase in US inflation one year ago
by 1% can increase inflation in Sumatra and Kalimantan now by 0.36% and by 0.22%
Page 13
respectively. However, the effect of US inflation is significant in Sumatra, but it is not
significant in Kalimantan. From 2000 to 2010, the value of import in Sumatra is higher
than that of in Kalimantan (Figure 1).
Figure 1. Import in Sumatra and Kalimantan
0
200
400
600
800
1000
1200
1400
1600
1800
2000
2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010
mill
ion
USD
Sumatera
Kalimantan
Source: Bank Indonesia
Meanwhile, the changes of exchange rate can positively affect inflation in all
regions. The effect of exchange rate changes is highly significant at 1%. The elasticity of
exchange rate changes in Sumatra, Java, Kalimantan, Sulawesi and Papua is 0.40, 0.34,
0.32, 0.37 and 0.34 respectively. An increase the changes of exchange rate depreciation by
1% can increase inflation by 0.40% (Sumatra), by 0.34% (Java), by 0.32% (Kalimantan),
by 0.37% (Sulawesi) and by 0.34% (Papua). These findings support previous studies found
that exchange rate significantly affects inflation (Endri, 2008; Gachet, Maldonado and
Perez, 2008; Kandil and Morsy, 2009; Khan and Gill, 2010).
Table 8. The Short-term Model (Panel Fixed Effect-Period)
Variable Sumatra Java Kalimantan Sulawesi Papua
ECM (-1) -0.13
(0.04)***
-0.13
(0.06)**
-0.14
(0.06)**
-0.16
(0.05)***
-0.21
(0.05)**
DCPI US (-1) 0.42
(0.18)**
0.28
(0.18)
0.30
(0.18)
0.21
(0.23)
0.19
(0.24)
DER 0.36
(0.02)***
0.34
(0.03)***
0.31
(0.02)***
0.37
(0.03)***
0.29
(0.02)***
DW
0.05
(0.04)
Page 14
DW (-1) 0.09
(0.04)**
0.03
(0.04)
0.06
(0.05)
0.10
(0.05)**
DTFP -0.34
(0.15)**
-0.31
(0.16)*
-0.46
(0.15)***
-0.37
(0.19)*
-0.52
(0.17)***
DKrs 0.08
(0.02)***
0.05
(0.02)**
0.09
(0.03)***
0.06
(0.02)**
DKrs (-1)
0.04
(0.02)*
C 0.06
(0.01)***
0.05
(0.01)***
0.06
(0.01)***
0.05
(0.01)***
0.05
(0.01)***
R2
0.88 0.89 0.92 0.91 0.88
Observation 160 100 80 80 100
Provinces 8 5 4 4 5
Notes: standard errors are shown below the parameter estimates
Significant 1% denoted by ***, 5% denoted by **, 10% denoted by *
Wage changes positively affected inflation in all regions with different lag. In Java
and Papua, the wage changes affected inflation without lag and insignificant. Meanwhile, it
significantly affected inflation in Sumatra and Kalimantan with one lag. The elasticity of
wage changes in both regions is 0.08 and 0.25 respectively. It means than an increase of
wage changes in previous year by 1% can increase inflation in current year by 0.08% in
Sumatra and by 0.25% in Kalimantan. These findings confirm previous research (Leheyda
2005) found that wages has significantly affected inflation.
Money supply growth positively affects inflation in Papua with one lag, but it is not
significant. Theoretically, money growth is positively associated with inflation (Monfort &
Pena 2008; Boujelbene & Boujelbene 2010). Increasing money growth can cause to
improve aggregate demand which positively affects inflation. The elasticity of money
growth is 0.01 meaning that an increase money growth by 1% in previous year can increase
inflation by 0.01% in Papua in current year.
Meanwhile, interest rate represented by time deposit rate and policy rate represented
by Bank Indonesia rate are positively related with inflation in Java, Kalimantan and
Sulawesi in the short-term. However, these relationships are not significant. Theoretically,
interest rate and policy rate have to negatively affect inflation. An increase policy rate can
increase time deposit rate and lending rate. Thus, increasing both rates can reduce
consumption and investment. Finally, aggregate demand will reduce in which reduces price
index. Therefore, both interest rate and policy rate are negatively associated with inflation.
Page 15
Furthermore, we will discuss the short-term model of inflation in each province in
each region separately. Table 9 reports that ECM in each province in Sumatra has a
negative coefficient as expected. The elasticity of ECM is relatively similar in each
province in Sumatra with the range between -0.03 and -0.05. They are significant at 1% in
all provinces in Sumatra. Meanwhile, expected inflation denoted by inflation lag 1 month
has positive effect on inflation in each province. The lowest impact is in Jambi (0.24%) and
the largest impact is in Riau and South Sumatra (0.38).
The changes of exchange rate can positively affect inflation in all provinces. They
are significant at 1% with the elasticity of exchange rate changes between 0.04 (North
Sumatra) and 0.10 (Bengkulu). An increase the changes of exchange rate depreciation by
1% can increase inflation by 0.10% in Bengkulu. These findings confirms previous studies
found that exchange rate are sources of inflation (e.g. Kandil and Morsy, 2009; Khan and
Gill, 2010). Another short-term factor, money supply changes is significant only in Bandar
Lampung with lag a month. As expected, kerosene price changes are positive and
significant (1%) in all provinces. The lowest impact is in Jambi that its elasticity is 0.06.
Meanwhile, the others are around 0.10.
Table 9. The Short-term Model (Sumatra)
Variable Aceh North Sumatra
West Sumatra
Riau Jambi South Sumatra
Bengkulu Bandar Lampung
ECM (-1)
-0.03
(0.01)***
-0.04
(0.01)***
-0.04
(0.01)***
-0.03
(0.01)***
-0.04
(0.01)***
-0.03
(0.01)***
-0.04
(0.01)***
-0.05
(0.01)***
DCPI
(-1)
0.28
(0.06)***
0.33
(0.05)***
0.27
(0.05)***
0.38
(0.05)***
0.24
(0.06)***
0.38
(0.05)***
0.32
(0.05)***
0.34
(0.05)***
DER (-1)
0.06
(0.02)***
0.04
(0.01)***
0.09
(0.01)***
0.08
(0.01)***
0.07
(0.01)***
0.08
(0.01)***
0.10
(0.01)***
0.05
(0.01)***
DM2 0.01
(0.01)
0.01
(0.01)
0.004
(0.01)
0.004
(0.01)
0.002
(0.01)
0.003
(0.01)
DM2
(-1)
0.01
(0.01)
0.01
(0.01)**
DKrs 0.10
(0.02)***
0.10
(0.01)***
0.09
(0.01)***
0.06
(0.01)***
0.06
(0.01)***
0.08
(0.01)***
0.10
(0.01)***
0.09
(0.01)***
C 0.01
(0.001)***
0.004
(0.001)***
0.01
(0.001)***
0.004
(0.001)***
0.01
(0.001)***
0.004
(0.001)***
0.004
(0.001)***
0.004
(0.001)***
R2 0.36 0.51 0.51 0.53 0.41 0.57 0.55 0.51
Obs 214 214 214 214 214 214 214 214
Notes: Standard errors are shown below the parameter estimates
Significant 1% denoted by ***, 5% denoted by **, 10% denoted by *
Page 16
Meanwhile, table 10 shows that ECM with one month lag in each province in Java
has a negative coefficient between -0.03 and -0.04. The expected inflation variable is also
significant at 1% in all provinces. The lowest impact of inflation expectation is in Central
Java (0.34) and the highest impact is in West Java (0.49). That means an increase in
expected inflation by 1% can increase inflation by 0.34% and 0.49% in Central Java and
West java respectively. The US inflation significantly affects domestic inflation in
Yogyakarta only. Its elasticity is 0.21 meaning an increase in US inflation by 1% can raise
inflation in Yogyakarta by 0.21%.
Similar with Sumatra, the changes of exchange rate with one month lag can
positively affect inflation in all provinces in Java. They are significant at 1%. The highest
elasticity of exchange rate changes is in East Java (0.10) and the lowest of that is in West
Java (0.04). An increase the changes of exchange rate depreciation by 1% can increase
inflation by 0.10% and 0.04% in East Java and West Java respectively.
Table 10. The Short-term Model (Java)
Variable Jakarta West Java Central
Java
Yogyakarta East Java
ECM
(-1)
-0.04
(0.01)***
-0.04
(0.01)***
-0.03
(0.01)***
-0.03
(0.01)***
-0.04
(0.01)***
DCPI
(-1)
0.47
(0.05)***
0.49
(0.05)***
0.34
(0.05)***
0.46
(0.05)***
0.41
(0.05)***
DCPIUS 0.21
(0.09)**
DER
(-1)
0.05
(0.01)***
0.04
(0.01)***
0.09
(0.01)***
0.09
(0.01)***
0.10
(0.01)***
DM2
0.001
(0.004)
DM2
(-1)
0.01
(0.004)*
0.01
(0.004)*
0.01
(0.004)*
DIP
-0.001
(0.0004)*
DKrs 0.04
(0.01)***
0.06
(0.01)***
0.08
(0.01)***
0.02
(0.01)***
0.05
(0.01)***
C 0.003
(0.001)***
0.003
(0.001)***
0.003
(0.001)***
0.003
(0.001)***
0.003
(0.001)***
R2
0.58 0.56 0.57 0.65 0.54
Obs 214 214 214 214 215
Notes: standard errors are shown below the parameter estimates
Significant 1% denoted by ***, 5% denoted by **, 10% denoted by *
Page 17
Money supply changes with a month lag is significant in Jakarta, West Java and
Central Java. They have similar elasticity (0.01). Policy rate in this model is significant
only in East Java with low elasticity (-0.001). This situation can be explained that policy
rate affects inflation indirectly and the lag range 3-6 months. The last factor in this model is
kerosene price changes. It is positive and significant (1%) in all provinces with the lowest
effect in Yogyakarta (0.02). It means an increase in kerosene price changes by 1% can
increase inflation by 0.02%.
Table 11. The Short-term Model (Kalimantan)
Variable West
Kalimantan
Central
Kalimantan
South
Kalimantan
East Kalimantan
ECM
(-1)
-0.04
(0.01)***
-0.75
(0.07)***
-0.03
(0.01)***
-0.03
(0.01)***
DCPI
(-1)
0.30
(0.05)***
0.30
(0.05)***
0.29
(0.05)***
DCPI
(-3)
0.003
(0.05)
DCPIUS 0.19
(0.11)*
0.18
(0.11)*
0.18
(0.09)*
DER
(-1)
0.09
(0.01)***
0.12
(0.01)***
0.09
(0.01)***
DM2 0.003
(0.01)
0.001
(0.01)
DM2
(-1)
0.01
(0.004)*
DKrs 0.05
(0.01)***
0.004
(0.16)
0.06
(0.01)***
0.06
(0.01)***
C 0.01
(0.001)***
0.01
(0.01)
0.004
(0.001)***
0.004
(0.001)***
R2
0.54 0.39 0.58 0.59
Obs 215 212 215 214
Notes: Standard errors are shown below the parameter estimates
Significant 1% denoted by ***, 5% denoted by **, 10% denoted by *
The short-term inflation model of provinces in Kalimantan can be seen on table 11.
The ECM with lag by 1 month in each province is significant at 1%. The elasticity of ECM
in each province is relatively similar around -0.03, except in Central Kalimantan (-0.75).
Meanwhile, expected inflation has positive effect on inflation in all provinces. They are
significant at 1%, except in Central Kalimantan. The elasticity of inflation expectation is
0.30 (West Kalimantan and South Kalimantan) and 0.29 (East Kalimantan). Foreign
Page 18
inflation significantly affects domestic inflation in West Kalimantan (0.19), South
Kalimantan (0.18), and East Kalimantan (0.18). Therefore, an increase in US inflation by
1% can raise inflation by 0.18% in South Kalimantan and East Kalimantan.
Meanwhile, the changes of exchange rate with one month lag have positive impact
on inflation in three provinces in Kalimantan, such as West Kalimantan, South Kalimantan,
and East Kalimantan. The highest elasticity of exchange rate changes is in South
Kalimantan (0.12) and followed by West Kalimantan and East Kalimantan (0.09).
Meanwhile, money supply changes with a month lag is significant only in East Kalimantan.
Its elasticity is 0.01 which means an increase in money supply changes by 1% can increase
inflation by 0.01% in East Kalimantan. Kerosene price changes have positive impact on
inflation in all provinces in Kalimantan and significant at 1%, except in Central Kalimantan
which is insignificant. The elasticity of kerosene price changes is 0.05 in West Kalimantan
and 0.06 in South Kalimantan and East Kalimantan.
Table 12. The Short-term Model (Sulawesi)
Variable North Sulawesi Central Sulawesi South Sulawesi Southeast Sulawesi
ECM
(-1)
-0.07
(0.01)***
-0.05
(0.01)***
-0.05
(0.01)***
-0.05
(0.01)***
DCPI
(-1)
0.21
(0.06)***
0.25
(0.06)***
0.24
(0.06)***
DCPI
(-3)
0.12
(0.06)***
DCPIUS
0.31
(0.14)**
DER
(-1)
0.03
(0.01)*
0.06
(0.02)***
0.07
(0.01)***
0.07
(0.02)***
DM2
0.004
(0.01)
0.001
(0.01)
0.01
(0.01)
DM2
(-3)
0.01
(0.01)**
DKrs 0.05
(0.01)***
0.03
(0.02)**
0.03
(0.01)**
0.08
(0.02)***
C 0.01
(0.001)***
0.01
(0.001)***
0.01
(0.001)***
0.01
(0.001)***
R2
0.41 0.36 0.43 0.47
Obs 212 214 214 214
Notes: standard errors are shown below the parameter estimates
Significant 1% denoted by ***, 5% denoted by **, 10% denoted by *
Page 19
In Table 12, there are four short-run inflation province models. Similar with
previous regions, ECM with one month lag in each province in Sulawesi is significant at
1%. The coefficient of ECM is -0.05 in all provinces, except in North Sulawesi (-0.07). The
inflation expectation in all provinces is significant at 1% with positive coefficient. North
Sulawesi has the lowest coefficient which is 0.12 meaning an increase in expected inflation
by 1% can lead inflation by 0.12%. Meanwhile, the other province’s coefficients are 0.21
(Central Sulawesi), 0.24 (Southeast Sulawesi) and 0.25 (South Sulawesi). Foreign inflation
influences inflation in Southeast Sulawesi with elasticity 0.31.
A month lag of exchange rate changes positively affects inflation in all provinces in
Sulawesi. The lowest elasticity of exchange rate changes is in North Sulawesi (0.03).
Meanwhile, the other three provinces (Central Sulawesi, South Sulawesi, and Southeast
Sulaesi) have an elasticity range 0.6-0.7. Money supply changes have no significant
affecting inflation in all provinces in Sulawesi, except North Sulawesi. An increase in three
month lag of money supply changes by 1% can lead inflation in North Sulawesi by 0.01%.
Another short-term factor, kerosene price changes, has positive effect on inflation in all
provinces in Sulawesi. The highest effect of that is in Southeast Sulawesi (0.08).
Table 13 reports the short-term inflation factor in all provinces in Papua. The ECM
with one month lag in each province is significant with coefficient between -0.03 and -0.07.
Meanwhile, the expected inflation positively influences inflation in Maluku (0.12), East
Nusa Tenggara (0.27), Bali (0.35), and West Nusa Tenggara (0.40), and. An increase in
inflation expectation by 1% can raise inflation by 0.12%, 0.27%, 0.35% and 0.40% in
Maluku, East Nusa Tenggara, Bali, and West Nusa Tenggara respectively.
Table 13. The Short-term Model Papua
Variable Bali West Nusa
Tenggara
East Nusa
Tenggara
Maluku Papua
ECM
(-1)
-0.03
(0.01)***
-0.05
(0.01)***
-0.03
(0.01)***
-0.07
(0.01)***
-0.05
(0.01)***
DCPI
(-1)
0.35
(0.05)***
0.40
(0.05)***
0.27
(0.06)***
0.12
(0.06)*
DER
0.03
(0.01)**
DER
(-1)
0.06
(0.01)***
0.08
(0.02)***
0.03
(0.02)
DER
(-2)
0.05
(0.01)***
Page 20
DM2 0.002
(0.01)
0.001
(0.01)
0.003
(0.01)
0.01
(0.01)
DM2
(-1)
0.01
(0.01)
DKrs 0.05
(0.01)***
0.07
(0.01)***
0.07
(0.01)***
0.04
(0.02)**
0.03
(0.02)*
C 0.004
(0.001)***
0.004
(0.001)***
0.01
(0.001)***
0.01
(0.001)***
0.01
(0.001)***
R2
0.50 0.49 0.34 0.31 0.13
Obs 214 214 215 215 215
Notes: standard errors are shown below the parameter estimates
Significant 1% denoted by ***, 5% denoted by **, 10% denoted by *
The exchange rate changes significantly influences inflation in all provinces in
Papua region, except in the Province of Papua. The highest elasticity of exchange rate
changes is in Maluku (0.08) and followed by Bali (0.06%), East Nusa Tenggara (0.05), and
West Nusa Tenggara (0.03). On the other hand, money supply changes are insignificant in
all provinces in Papua, even their impacts are positive to inflation. Meanwhile, kerosene
price changes have significantly affected on inflation in all provinces. The lowest effect is
in the Province of Papua (0.03). It means an increase in kerosene price changes by 1% can
increase inflation by 0.03% in this province.
5. Conclusion and Policy Recommendation
In the long run, inflation in each region and province has been determined by
similar factors which are foreign price and exchange rate. The foreign price represented by
CPI of United States positively affects domestic price. It means an increase in foreign price
can raise domestic price. The fact that the value of import in Indonesia has shown a
positive trend, therefore the domestic price is sensitive to foreign price. This condition
verifies the finding that foreign price positively associated with domestic price. In the
short-term, foreign price also affects domestic price in Sumatra and Kalimantan.
Meanwhile, exchange rate represented by US Dollar against Indonesia Rupiah also
positively affects domestic price in the long and short-term. Depreciating Indonesia Rupiah
against US will be followed by increasing domestic price. Since many products in
Indonesia are from foreign countries, the domestic price is more sensitive with exchange
rate. Empirical findings also prove that exchange rate is significantly affecting inflation in
Page 21
the short-term in all regions. This finding strengthens previous studies (Siregar & Rajaguru
2002; Wimanda 2006) found that main determinant of inflation in Indonesia is exchange
rate.
Money supply represented by broad money has also positively affected domestic
price in the long-term in Java and Kalimantan. This finding confirms previous study that
found a strong link between money growth and inflation (Listiani 2006; Monfort & Pena
2008; Boujelbene & Boujelbene 2010). Money supply also affects inflation in the short-
term in Papua, but it is not significant. Other short-term factors of inflation are wage, time
deposit rate and policy rate. Wage is positively affecting on inflation in all regions as
expected. However, these effects are only significant in Sumatra and Kalimantan with one
lag. On the other hand, time deposit rate and policy rate are positively related with
inflation, but they are not significant.
According to the empirical findings, Bank Indonesia as central bank of Indonesia
must maintain the stability of exchange rate since the role of exchange rate is really
important to influence inflation. Moreover, Bank Indonesia should concern with their
policy instrument, since Bank Indonesia rate as the policy rate is not significantly affecting
inflation. However, another monetary instrument, base money is still effective to control
inflation. The finding that money supply is significantly affecting inflation should not be
neglected. Therefore, Bank Indonesia could not rely on their policy rate only, but they can
also use their other policy instrument, such as base money.
The effort of Bank Indonesia to achieve a low and stable inflation is needed the
support of government. Based on the conclusion, the government can support to reduce the
impact of foreign price by issuing import policy. The policy can limit a number of good
imports and prevent domestic price from any various foreign inflation. Moreover, the
government can also release the export policy which supports local entrepreneurs to
increase the value of export. This policy can help Bank Indonesia to strengthen Indonesia
rupiah against foreign currencies.
Page 22
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Page 24
Appendix
The Long-term Model of CPI Province
No Province C CPIUS ER R2
Obs
1 Banda Aceh
-29.10
(0.61)***
6.15
(0.15)***
0.31
(0.02)***
0.97 216
2 North
Sumatra
-23.08
(0.54)***
4.75
(0.13)***
0.42
(0.02)***
0.97 216
3 West Sumatra
-22.80
(0.53)***
4.70
(0.13)***
0.42
(0.02)***
0.97 216
4 Riau
-23.25
(0.56)***
4.84
(0.13)***
0.38
(0.02)***
0.97 216
5 Jambi
-21.76
(0.49)***
4.62
(0.12)***
0.34
(0.02)***
0.97 216
6 South
Sumatra
-24.22
(0.56)***
5.02
(0.13)***
0.40
(0.02)***
0.97 216
7 Bengkulu
-21.69
(0.50)***
4.55
(0.12)***
0.38
(0.02)***
0.97 216
8 Lampung
-22.74
(0.53)***
4.71
(0.13)***
0.40
(0.02)***
0.97 216
9 Jakarta
-20.31
(0.46)***
4.23
(0.11)***
0.40
(0.02)***
0.97 216
10 West Java
-20.77
(0.49)***
4.39
(0.12)***
0.36
(0.02)***
0.97 216
11 Central Java
-20.09
(0.48)***
4.32
(0.11)***
0.32
(0.02)***
0.97 216
12 Yogyakarta
-21.90
(0.50)***
4.57
(0.12)***
0.39
(0.02)***
0.97 216
13 East Java
-20.67
(0.54)***
4.32
(0.13)***
0.39
(0.02)***
0.97 216
14 Bali
-19.54
(0.54)***
4.09
(0.13)***
0.39
(0.02)***
0.96 216
Page 25
15 West
Kalimantan
-21.19
(0.48)***
4.35
(0.11)***
0.43
(0.02)***
0.98 216
16 Central
Kalimantan
-20.30
(0.89)***
4.22
(0.21)***
0.40
(0.03)***
0.91 216
17 South
Kalimantan
-20.55
(0.46)***
4.35
(0.11)***
0.36
(0.02)***
0.97 216
18 East
Kalimantan
-21.88
(0.47)***
4.60
(0.11)***
0.37
(0.02)***
0.97 216
19 North
Sulawesi
-21.49
(0.52)***
4.44
(0.12)***
0.41
(0.02)***
0.97 216
20 Central
Sulawesi
-25.55
(0.63)***
5.18
(0.15)***
0.45
(0.02)***
0.97 216
21 South
Sulawesi
-19.96
(0.51)***
4.20
(0.12)***
0.38
(0.02)***
0.97 216
22 Southeast
Sulawesi
-24.98
(0.58)***
5.15
(0.14)***
0.41
(0.02)***
0.97 216
23 West Nusa
Tenggara
-20.40
(0.53)***
4.26
(0.13)***
0.39
(0.02)***
0.97 216
24 East Nusa
Tenggara
-23.73
(0.57)***
5.06
(0.14)***
0.32
(0.02)***
0.96 216
25 Maluku
-19.52
(0.52)***
4.07
(0.12)***
0.40
(0.02)***
0.97 216
26 Papua
-25.05
(0.55)***
5.35
(0.13)***
0.30
(0.02)***
0.97 216
Notes: standard errors are shown below the parameter estimates
Significant 1% denoted by ***, 5% denoted by **, 10% denoted by *