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Externalities and social cost
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Externalities
ExternalitiesExternalities
Externalities in production(a) external costs
Externalities in production(a) external costs
Q1O
MC = S
DP
Co
sts
and
be
nef
its
Quantity
External costs in productionExternal costs in production
O
MC = S
DP
MSC
Co
sts
and
be
nef
its
Quantity
External cost
Q1Q2
Social optimum
External costs in productionExternal costs in production
ExternalitiesExternalities
Externalities in production(b) external benefits
Externalities in production(b) external benefits
O
DP
MC = S
Q1
Co
sts
and
be
nef
its
Quantity
External benefits in productionExternal benefits in production
O
MSC
DP
Q1
External benefit
Co
sts
and
be
nef
its
Quantity
MC = S
Q2Social optimum
External benefits in productionExternal benefits in production
O
MC = S
DP
Q1Q2
Cos
ts a
nd b
enef
its (
£)
Quantity
MSC
External cost
(a ) External costs
O
DP
Q2Q1
Cos
ts a
nd b
enef
its (
£)
Quantity
MSCMC = S
External benefit
(b) External benefits
External costs and benefits in production
ExternalitiesExternalities
Externalities in consumption(a) external costs
Externalities in consumption(a) external costs
Q1
(MB)MU = D
O
DP
Co
sts
and
be
nef
its
Quantity
External costs in consumptionExternal costs in consumption
Q2
(MB)MU = D
O
DP
Co
sts
and
be
nef
its
Quantity
External cost
MSB
Q1
External costs in consumptionExternal costs in consumption
Social optimum
ExternalitiesExternalities
Externalities in consumption(b) external benefits
Externalities in consumption(b) external benefits
(MB)MU = D
O
DP
Q1
Co
sts
and
be
nef
its
Quantity
External benefits in consumptionExternal benefits in consumption
Q2
(MB)MU = D
O
DP
Q1
Co
sts
and
be
nef
its
Quantity
External benefit
MSB
External benefits in consumptionExternal benefits in consumption
Social optimum
O
MB
PP
Cos
ts a
nd b
enef
its (
£)
Car miles
MSB
External cost
O
MB
PP
Q1
Cos
ts a
nd b
enef
its (
£)
Rail miles
Q2
MSB
External benefit
(a ) External costs (b) External benefits
External costs and benefits in consumption
Q1Q2
ExternalitiesExternalities
Using taxes to correct for an externality(a) external cost in production
Using taxes to correct for an externality(a) external cost in production
Q1O
MC = S
DP
Co
sts
and
be
nef
its
Quantity
Using taxes to correct a market distortionUsing taxes to correct a market distortion
O
MC = S
DP
MSC
Co
sts
and
be
nef
its
Quantity
External cost
Q1Q2
Social optimum
Using taxes to correct a market distortionUsing taxes to correct a market distortion
Q2
MC
Q1O
DP
Co
sts
and
be
nef
its
Quantity
Optimum tax = MSC – MC
MC = SMSC
Using taxes to correct a market distortionUsing taxes to correct a market distortion
Amount of tax
Q2
MC
Q1O
DP
Co
sts
and
be
nef
its
Quantity
MC = SMSC
Using taxes to correct a market distortionUsing taxes to correct a market distortion
ExternalitiesExternalities
Using subsidies to correct for an externality(a) external benefits in production
Using subsidies to correct for an externality(a) external benefits in production
O
DP
MC = S
Q1
Co
sts
and
be
nef
its
Quantity
Using subsidies to correct a market distortionUsing subsidies to correct a market distortion
O
MSC
DP
Q1
External benefit
Co
sts
and
be
nef
its
Quantity
MC = S
Q2Social optimum
Using subsidies to correct a market distortionUsing subsidies to correct a market distortion
MC
O
P
Q2Q1
Co
sts
and
be
nef
its
Quantity
Optimum subsidy
= MC – MSC
MSCMC = S
D
Using subsidies to correct a market distortionUsing subsidies to correct a market distortion
Amount ofsubsidy
MC
O
P
Q2Q1
Co
sts
and
be
nef
its
Quantity
MSCMC = S
D
Using subsidies to correct a market distortionUsing subsidies to correct a market distortion