1. From employee’s perspective
<econ ag> recipient
<econ ag>
Employee School
provider provider
recipient
<econ res> <decrement> <increment>
take
Money Pay Buy educ. <econ res>
give dual
Lessons
consumes
<decrement> <increment>
Cons less Learn lang
produce
<econ res>
consumes <decrement>
Time
Cons time <econ res>
Language skill
consumes
<econ res> <decrement>
Attention Cons attent

2. From employee’s perspective
<econ ag> recipient
<econ ag>
Employee School
provider provider
recipient
<econ res> <decrement> <increment>
take
Money Pay Buy educ. <econ res>
give dual
Lessons
consumes
<decrement> <increment>
Cons less Learn lang
take
produce
<decrement>
Use labour <econ res>
use Labour
<increment> <decrement>
Get salary dual
Sell labour give

3. Which are value objects?
•Reminders
•Goods
•Quotations
•Money
•Acknowledgements

4. <econ res>
<econ res> Goods
Raw material consume
<decrement> <increment>
Cons raw mat Produce goods produce
<decrement> use <econ res>
Produce garbage Garbage
<econ res> <decrement> produce
consume <increment>
Removal service Consume garbage
Remove garbage
Removal service
take Note that
garbage is
<increment> <econ res>
<decrement> give viewed as
Buy Removal Cash
Pay for service having
service
negative value

5. From advertiser’s perspective
<econ ag> recipient
<econ ag>
Advertiser Radio station
provider provider
recipient
<econ res> <decrement> <increment>
take
Money Pay Buy ad space. <econ res>
give dual
Ad space
consumes
<decrement> <increment>
Cons less Get attention
produce
<decrement>
Use commercial <econ res>
Attention
use
<econ res>
Commercial