In 1980, the iconoclastic economist Julian Simon challenged celebrity biologist Paul Ehrlich to a bet. Their wager on the future prices of five metals captured the public’s imagination as a test of coming prosperity or doom. Ehrlich, author of the landmark book The Population Bomb, predicted...

Commodity price increases associated with the entry of China, India, and other countries into the world economy have led to increased pressure on common-property renewable natural resources. The problem is particularly worrisome for economies that obtain a large share of their income from the...