What can bees teach economists about how markets work?
He discovered that apple farmers routinely paid bee-keepers for the service of pollinating their crops.
So apples and bees aren't a good example of a positive externality, because the interaction does take place in a marketplace. And that marketplace is huge. The numbers are astonishing: 85% of the two million commercial hives in the US are moved, containing tens of billions of bees.
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