Output Gap Measurement and Prospects in the Wake of the Crisis

Different concepts of potential GDP

For serious macroeconomists, the magnitude (or existence) of the output gap is a central factor for determining the appropriate policy actions (see for instance Weidner and Williams). In several recent posts, I’ve discussed the variety of approaches to estimating the output gap [0] [1]. A recent symposium on Projecting Potential Growth published by the Federal Reserve Bank of St. Louis is an excellent resource for anybody who wants to think seriously and carefully about the challenges in estimating this variable. In the lead article entitled “What Do We Know (And Not Know) About Potential Output?”, the authors Susanto Basu and John Fernald write:

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In the news

Russ Roberts, Mark Calabria, and I weigh in on the lessons from CIT at the NYT.

And the WSJ surveys economics blogs. I’ll give away the plot: the one you’re reading rates “five calculators” on the geekiness scale.

Casey Mulligan on the Stimulus: Stock-Flow Mismatch, Sectoral Stimulus Mismatch, and Construction Crowding Out

In today’s Economix post, Casey Mulligan argues that the greater than predicted unemployment numbers should not be ascribed to the negative effect of the stimulus, but rather to bigger than anticipated negative shocks.

We cannot blame the Obama administration for failing to predict June’s 9.5 percent unemployment rate. That result just shows the size of the shocks hitting the economy: Even the best forecasters can miss the unemployment rate by almost two percentage points, even when forecasting fewer than six months ahead.

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Pre-ARRA, How Badly Did Macroeconomic Forecasters Overpredict GDP and Employment in 2009Q1?

There’s been a lot of breast beating over the fact that the Administration underestimated the severity of the downturn. From this has come a lot of confused argument — sometimes not internally consistent — over whether this invalidates the usefulness of the stimulus package, whether the stimulus worsened the economic outlook, etc. I’ll dispense with the clearly economically illogical arguments and try to tease out what is the “surprise” element in the 2009Q1 figures, and from that infer how much worse the economy was relative to what private sector forecasters predicted, conditional upon the passage of the ARRA.

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