<econ ag>Employee

<econ ag>School

<increment>Buy educ.

From employee’s perspective

<decrement>Pay

<econ res>Money <econ res>

Lessons

provider recipient

recipient

provider

<increment>Learn lang

<decrement>Cons less

<decrement>Cons time

givetake

dual

<econ res>Time

<econ res>Attention

consumes

consumes<econ res>

Language skill

produce

<decrement>Cons attent

consumes

<econ ag>Employee

<econ ag>School

<increment>Buy educ.

From employee’s perspective

<decrement>Pay

<econ res>Money <econ res>

Lessons

provider recipient

recipient

provider

<increment>Learn lang

<decrement>Cons less

<decrement>Use labour

givetake

dual

consumes

<econ res>Labour

produce

use

<decrement>Sell labour

<increment>Get salary givedual

take

Which are value objects?

•Reminders•Goods•Quotations•Money•Acknowledgements

<econ res>Raw material

<decrement>Cons raw mat

<increment>Produce goods

<econ res>Goods

produce

consume

<econ res>Garbage

<decrement>Produce garbage

use

<increment>Remove garbage

<decrement>Consume garbageRemoval service

produce<econ res>Removal serviceconsume

<increment>Buy Removal

service<decrement>

Pay for service

<econ res>Cash

take Note thatgarbage is viewed as havingnegative value

give

<econ ag>Advertiser

<econ ag>Radio station

<increment>Buy ad space.

From advertiser’s perspective

<decrement>Pay

<econ res>Money <econ res>

Ad space

provider recipient

recipient

provider

<increment>Get attention

<decrement>Cons less

<decrement>Use commercial

givetake

dual

consumes

<econ res>Attention

produce

<econ res>Commercial

use