How many economists does it take to change a lightbulb?

Answer:

  • Two: One to change the bulb and one to assume the existence of a ladder.
  • Eight: One to screw in the light bulb and seven to hold everything else constant.
  • None: They are all waiting for an invisible hand.

Found on Yale Economc Review YER, by Stanley Alcorn and Ben Solarz, Summer 2006 … but the joke is still good ...(the long article debates the subject).

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