1_ what is Revealed Preference Theory (Paul Samuelson). give an example for it?

2_what is Class Conflict Theory (KARL MARX). give an example for it?

3_what is THEORY OF WAGES (david ricardo). give an example for it?

4_what is theory of Value (Aristotle). give an example for it?

5_what is Economic goals. give an example for it?

6_ what is Economic systems. give an example for it?

7_what is Opportunity Costs. give an example for it?

8_what is GDP. give an example for it?

(site all your resources)