When we think about productivity in an economy, we are normally referring to the output of human workers. But some segments of the economy also feature a nonhuman labor force.
Dairy cows, for example, are a key part of the milk industry. And according to this striking chart from the US Department of Agriculture, their productivity has surged over the past generation:
USDA
Cow wages, presumably, have not increased commensurately during this period.
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