What might have been the opportunity cost for someone who decide to invest in the stock market in the 1920s?

Answer 1

The person could have spent the money on other things -- like vacations, bonds, and luxury goods.

Answer 2

http://www.econlib.org/library/Enc/OpportunityCost.html

Answer 3

The investors might make money or lose money because it is successful or unsuccessful.

Answer 4

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