You must not know any farmers. Most of the farmers that I know DO raise multiple crops for the very reasons you descrribe. They also grow different crops in the same field in different seasons. If I already know how to grow wheat, it doesn't take a lot of education to learn corn. Likewise, if I know Windows, it's not so hard to learn Mac or *nix. Next time you eat Tofu, realize that the soybeans to make it were probably grown in the same field that grew the cotton for your T-shirt.

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