…Barack Obama should learn from F.D.R.’s failures as well as from his achievements: the truth is that the New Deal wasn’t as successful in the short run as it was in the long run. And the reason for F.D.R.’s limited short-run success, which almost undid his whole program, was the fact that his economic policies were too cautious.
In another paragraph:
The economic lesson is the importance of doing enough. F.D.R. thought he was being prudent by reining in his spending plans; in reality, he was taking big risks with the economy and with his legacy. My advice to the Obama people is to figure out how much help they think the economy needs, then add 50 percent. It’s much better, in a depressed economy, to err on the side of too much stimulus than on the side of too little.
The whole article, at Paul Krugman’s column, is here.