A chemist, a physicist, and an economist are all trapped on a desert island, trying to figure out how to open a can of food.
“Let’s heat the can over the fire until it explodes,” says the chemist.
“No, no,” says the physicist, “let’s drop the can onto the rocks from the top of a high tree.”
“I have an idea,” says the economist. “First, we assume a can opener . . .”

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