the main points in this video:
0:00 introduction
1:56 difference between self and social interest
10:26 economic way of thinking
11:00 trade off meaning
15:39 rational choice meaning
19:29 benefit meaning
24:55 opportunity cost meaning
30:42 marginal meaning
46:42 incentives meaning
51:13 positive and normative economics
1:16:27 economic problem questions
1:38:00 questions