One lesson from the Great Depression is that you should never underestimate the destructive power of bad ideas. And some of the bad ideas that helped cause the Depression have, alas, proved all too durable: in modified form, they continue to influence economic debate today.

What ideas am I talking about? The economic historian Peter Temin has argued that a key cause of the Depression was what he calls the “gold-standard mentality.” By this he means not just belief in the sacred importance of maintaining the gold value of one’s currency, but a set of associated attitudes: obsessive fear of inflation even in the face of deflation; opposition to easy credit, even when the economy desperately needs it, on the grounds that it would be somehow corrupting; assertions that even if the government can create jobs it shouldn’t, because this would only be an “artificial” recovery.

In the early 1930s this mentality led governments to raise interest rates and slash spending, despite mass unemployment, in an attempt to defend their gold reserves. And even when countries went off gold, the prevailing mentality made them reluctant to cut rates and create jobs.

But we’re past all that now. Or are we?

America isn’t about to go back on the gold standard. But a modern version of the gold standard mentality is nonetheless exerting a growing influence on our economic discourse. And this new version of a bad old idea could undermine our chances for full recovery.