"This paper argues that when the financial crisis came policy-makers relied on some version of the Hicksian sticky-price IS-LM as their default model; these models were ‘good enough for government work'. While there have been many incremental changes suggested to the DSGE model, there has been no single ‘big new idea' because the even simpler IS-LM type models were what worked well. In particular, the policy responses based on IS-LM were appropriate. Specifically, these models generated the insights that large budget deficits would not drive up interest rates and, while the economy remained at the zero lower bound, that very large increases in monetary base wouldn't be inflationary, and that the multiplier on government spending was greater than 1. The one big exception to this satisfactory understanding was in price behaviour. A large output gap was expected to lead to a large fall in inflation, but did not. If new research is necessary, it is on pricing behaviour. While there was a failure to forecast the crisis, it did not come down to a lack of understanding of possible mechanisms, or of a lack of data, but rather through a lack of attention to the right data."

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