From its bottom in 1933 to 1936, the G.D.P. climbed spectacularly (albeit from a very low base), averaging gains of almost 11 percent a year. But then, both the Fed and the administration of Franklin D. Roosevelt reversed course.

In the summer of 1936, the Fed looked at the large volume of excess reserves piled up in the banking system, concluded that this mountain of liquidity could be fodder for future inflation, and began to withdraw it. …

About the same time, President Roosevelt looked at what seemed to be enormous federal budget deficits, concluded that it was time to put the nation’s fiscal house in order and started raising taxes and reducing spending. …

Thus, both monetary and fiscal policies did an abrupt about-face in 1936 and 1937, and the consequences were as predictable as they were tragic. The United States economy, which had been rapidly climbing out of the cellar from 1933 to 1936, was kicked rudely down the stairs again