Productivity Decline

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Since the 1990s, not all is well in the world of food and here is one big reason why: productivity gains are not coming at the rate they used to.

 

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Your first instinct was right. Average yield is, basically, crop efficiency measured in amount of crop (say in kg) per area farmed. Total yield is like GDP, kind of. So, if efficiency gains (average yield) are decreasing then total yield (GDP) gains will also decrease ... UNLESS the amount of area devoted to farming increases enough to offset the difference (which obviously can't happen for very long).

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