e. kevin murphy of the chicago graduate school of business recently visited london to present his research on the value of health improvements in the us since 1970. they're vast - about $10 trillion in today's money. looking further back, if you had to choose between the material progress of the 20th century and the improvements in health, it would be a toss-up. the health gains are as valuable as everything else put together. encouragingly, health in most developing countries has improved faster than in rich ones, suggesting that global inequality is falling.

　　and a more personal piece of good news: murphy reckons the delicious cheeseburger i ate before interviewing him only cost me ?1 worth of health. talk about a good deal.

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