A farmer whose corn always took the first prize at the state fair had a habit of sharing his best corn seed with all the farmers in the neighborhood. When asked why, he said, “It is really a matter of self-interest. The wind picks up the pollen and carries it from field to field. So if my neighbors grow inferior corn, the cross-pollination brings down the quality of my own corn. That is why I am concerned that they plant only the very best.”

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