One day, 11,374 years ago, a flint-chipper named Og, whose wife had unsympathetically thrown his collection of tiger teeth out of the cave, began giving one tiger tooth to anybody who bought two of his flints for ten clams. Soon Og found that he was selling flints by the bushel and running so low on tiger teeth that he had to get moreĀeven if it meant hunting tigers. This was a nuisance and expensive; to cover the cost, he raised the price of his flints to 15 clams a pair. And to his...
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