Q: How Many Economists Does It Take To Screw In A Light Bulb?

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Q: How many economists does it take to screw in a light bulb?
A: Two. One to assume the ladder and one to change the bulb.
A': None. If the government would just leave it alone, it would screw
itself in.
A'': None. If the light bulb really needed changing, market forces would
have already caused it to happen.