Suddenly, creating jobs is out, inflicting pain is in. Condemning deficits and refusing to help a still-struggling economy has become the new fashion everywhere, including the United States, where 52 senators voted against extending aid to the unemployed despite the highest rate of long-term joblessness since the 1930s.

Many economists, myself included, regard this turn to austerity as a huge mistake. It raises memories of 1937, when F.D.R.’s premature attempt to balance the budget helped plunge a recovering economy back into severe recession. And here in Germany, a few scholars see parallels to the policies of Heinrich Brüning, the chancellor from 1930 to 1932, whose devotion to financial orthodoxy ended up sealing the doom of the Weimar Republic.

But despite these warnings, the deficit hawks are prevailing in most places - and nowhere more than here, where the government has pledged 80 billion euros, almost $100 billion, in tax increases and spending cuts even though the economy continues to operate far below capacity.

What’s the economic logic behind the government’s moves? The answer, as far as I can tell, is that there isn’t any. Press German officials to explain why they need to impose austerity on a depressed economy, and you get rationales […]