Cheap depends on how we define the cost. In relative terms, food is more expensive than ever:
https://en.wikipedia.org/wiki/Baumol_effect
Food is not Baumol, productivity increases is how we went from 80% of the population working in primary food production to 1%. These increases have not stopped.
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Food is not Baumol, productivity increases is how we went from 80% of the population working in primary food production to 1%. These increases have not stopped.