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There was an economist who was walking down the street with a friend.
The friend stops and says, "Look, there is a $20 bill on the ground!"

The economist turns and coolly replies, "Can't be. If there was a $20 bill on the ground, somebody would have already picked it up."

There's always a bit of the opposite effect too. If supply of something is extremely low, then people eventually stop looking for it. People might want the object, but they might not express that desire if the supply is next to non-existent.

supply shapes demand as much as demand shapes supply