speaking seems to cost almost nothing—just the calories we expend flexing our vocal cords and firing our neurons as we turn thoughts into sentences. But this is just the tip of the iceberg. A full accounting will necessarily include two other, much larger costs: 1.The opportunity cost of monopolizing information. As Dessalles says, “If one makes a point of communicating every new thing to others, one loses the benefit of having been the first to know it.”11 If you tell people about a new berry patch, they’ll raid the berries that could have been yours. If you show them how to make a new tool,
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