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In the long run, yes, this is true.

However there is a long lead time for changing how many animals there are in the food pipeline. Thus the amount of meat animals does not increase very rapidly to respond to a bumper crop in wheat. (The meat supply can, however, drop rapidly after a drought or flood...)

And the yearly fluctuations in crop yields tend to be fairly large. Certainly larger than the variation we're likely to see in how much people want to eat.

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