Two-Handed Economists Slug It Out

But I think it’s worth pointing out why Ms. Shlaes thinks the New Deal was destructive of employment: namely, that it raised wages. Funny she should mention that — because the effect of wage changes on employment was the subject of a whole chapter in Keynes’s General Theory.

And what Keynes had to say then is as valid as ever: under depression-type conditions, with short-term interest rates near zero, there’s no reason to think that lower wages for all workers — as opposed to lower wages for a particular group of workers — would lead to higher employment.

Suppose that wages across the US economy had been, say, 20 percent lower than they actually were. You might be tempted to say that this would make hiring workers more attractive. But to a first approximation, prices would also have been 20 percent lower — so the real wage would not have been reduced. So how would lower wages lead to higher demand for labor?

Well, the real money supply would have been larger — but the normal channel through which this might increase demand, lower interest rates, was blocked by the zero lower bound. Yes, there would have been a slight Pigou effect: real private sector wealth would have been higher, because cash under the mattress (or wherever) was worth more. But on the other hand, real debt burdens would also have been higher, probably exerting a contractionary effect. Overall, there’s no good reason to think that lower wages would have helped raise employment.