“During the 1920s, there was no substantial difference in the economic performance of nations that, in the mid-1930s, were democratic regimes or dictatorships,” the authors note. “The depth of the depression was only slightly greater in Germany than in France or the Netherlands, and was even worse in Austria (and other eastern European nations) and the USA.” Of those countries, Austria also saw a radical right-wing dictatorship come to power under Engelbert Dollfuss, in 1932. But France, the Netherlands, and the US did not see radical right-wing parties take office.
Also troubling for the most simplistic economic explanation is the fact that unemployed people weren't particularly likely to vote for Nazis. The authors cite reams of research showing that the unemployed were likelier to vote for the Communists or the Social Democrats. “It was not that Hitler did not try to appeal the unemployed masses,” they note, “but rather that the Communist Party was perceived as the party that traditionally represented workers’ interests.” [...]
That's where austerity comes in. The scale of the cutback that Brüning enacted from 1930 to 1932 is truly staggering. The authors estimate that Brüning cut German government spending by about 15 percent, after inflation, from 1930 to 1932. He raised income taxes on high earners by an average of 10 percent, and slashed unemployment, pension, and welfare benefits.
The economic consequences were horrific. GDP fell by 15 percent, as did government revenue. Unemployment increased from 22.7 percent to 43.8 percent. Brüning came to be known as the “Hunger Chancellor.” [...]
While the authors don't give a definitive answer, they note that the Nazis ran on an anti-austerity platform, complementing their hypernationalist and anti-Semitic themes. They promised tax breaks, to "maintain the social insurance system," to secure "a generous expansion of support for the aged," and to expand investment in highways.