(2.a) Comparative Advantage and Gains From Trade
Four videos and practice questions are available here.
(2.b) Trade, Specialization, and the Origin of Wealth
(2.b.i) The Bounty of Trade: When Robinson Met Friday [article]
(2.b.ii) David Hume meets a locavore [article]
(2.c) The Parable of the magic island
Video available here.
