题目内容

Mitch has $100 to spend and wants to buy either a new amplifier for his guitar or a new mp3 player to listen to music while working out. Both the amplifier and the mp3 player cost $100, so he can only buy one. This illustrates the basic concept that

A. Trade can make everyone better off
B. People respond to incentives
C. Rational people think at the margin
D. People face tradeoffs and opportunity costs.

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