The phrase diminishing returns is such a cliché that few people give it much thought. Picking out the pecans from a bowl of salted nuts gives diminishing returns: The pieces of pecan in the bowl get rarer and smaller. The fingers keep finding almonds, hazelnuts, cashews, or even—God forbid—Brazil nuts. Gradually the bowl, like a moribund gold mine, ceases to yield decent returns of pecan.
Now imagine a bowl of nuts that has the opposite character. The more pecans you take, the larger and more numerous they grow. That is the human experience for the last 100,000 years. The global nut bowl has yielded ever more pecans.
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