Chickens, Eggs and Economic Development: Imaginary assumptions = imaginary outcomes

My favorite explain-everything joke is the one Woody Allen, as Alvy Singer, recollects in a voice-over at the end of Annie Hall:

“This guy goes to a psychiatrist and says, ‘Doc, uh, my brother’s crazy, he thinks he’s a chicken,’ and uh, the doctor says, ‘well why don’t you turn him in?’ And the guy says, ‘I would, but I need the eggs.’”

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