Should Greece Devalue?

by John H. Cochrane

The Grumpy Economist
January 5, 2012

Two weeks ago I wrote the following in a little Bloomberg column about the Euro

Defenders [of devaluation] think that devaluing would fool workers into a bout of “competitiveness,” as if people wouldn’t realize they were being paid in Monopoly money. If devaluing the currency made countries competitive, Zimbabwe would be the richest country on Earth. No Chicago voter would want the governor of Illinois to be able to devalue his way out of his state’s budget and economic troubles. Why do economists think Greek politicians are so much wiser?

This paragraph set off a little kerfuffle in the Cochrane-is-a-moron section of the blogosphere. I won't respond in detail, because I presume you're more interested in economics than what anyone thinks of anyone else's intelligence.

But the paragraph was mighty distilled, and the evident interest in the question suggests a little fuller examination of whether devaluation is a good idea or not for a country like Greece, and trying to understand why people come to such different views.

I think I can sum it up this way: Devaluation is like a cigarette. The Keynesian camp basically says, "Boy, a cigarette would perk me up right now."' Modern macroeconomists (I'm looking for a good name -- "Dynamic?" "Intertemporal?" "Equilibrium?" Really everybody else, including new-Keynesians) basically say "Maybe, but smoking is a really bad lifestyle decision." We think of policies as rules, not decisions.

The following discussion resembles that between a teenager and the parent who found a pack of cigarettes. It sounds like facts are at issue -- just how good does it really feel, just how long does it take to get addicted, how bad are the long-run effects -- but there is a deeper difference in perspective, which is why the arguments are a lot more heated than the simple facts suggest.

So, just how good is a cigarette anyway?

Devaluation works if prices and wages don't adjust. If the Drachma goes from 1:1 Euros to 2:1 Euros and Greek prices and wages double, nothing happens. On the other hand, if prices and wages don't change, then Greek goods are cheaper and Greece will produce and export more. Similarly, inflation can goose output a bit. For example, if prices go up faster than wages, then companies will hire more workers and make more goods. (Standard disclaimer: I'm simplifying dramatically. Don't write that I'm an ignoramus because I can't get the whole modern theory of the Phillips curve into one sentence of a blog post written for a popular audience.)

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