52:38

Chapter 23: Measuring the Income of a Nation

1:06:43

Chapters 10 and 11: Externalities and Public Goods

1:21:33

Chapter 13: The Cost of Production

1:10:04

International Economics: Exchange Rates

34:21

International Economics: The Heckscher-Ohlin model of trade: Part1 - a single country

1:20:25

Chapter 15 - Monopoly

57:26

Chapter 25: Production and Growth

39:08

International Economics: The Ricardian Model of Trade: Part 1 - The Farmer and the Rancher