Monday, July 28, 2008

Cost of climate change: how risk-averse are we?

Paul Krugman asked.

"on any sort of expected-welfare calculation, the small probability of catastrophe dominates the expected loss. Suppose that there’s a 99% chance that Lomborg is right, but a 1% chance that catastrophic climate change will reduce world GDP by 90%. You might be tempted to disregard that small chance — but if you’re even moderately risk averse (say, relative risk aversion of 2 — econowonks know what I mean), you quickly find that the expected loss of welfare isn’t 0.5% of GDP, it’s 10% or more of GDP."

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