The Unassuming Economist

In my latest IMF working paper with Zidong An and Joao Jalles, “We describe the evolution of forecasts in the run-up to recessions. The GDP forecasts cover 63 countries for the years 1992 to 2014. The main finding is that, while forecasters are generally aware that recession years will be different from other years, they miss the magnitude of the recession by a wide margin until the year is almost over. Forecasts during non-recession years are revised slowly; in recession years, the pace of revision picks up but not sufficiently to avoid large forecast errors. Our second finding is that forecasts of the private sector and the official sector are virtually identical; thus, both are equally good at missing recessions. Strong booms are also missed, providing suggestive evidence for Nordhaus’ (1987) view that behavioral factors—the reluctance to absorb either good or bad news—play a role in the evolution of forecasts.”

Continue reading here. Here is the link to my 2001 paper.

From a new blog by Mark J. Perry:

“In Warren Buffett’s 2017 annual letter to shareholders, released on Saturday, he discussed the ten-year bet he made in 2007 that an unmanaged, low-cost S&P-500 index fund would out-perform an actively managed group of high-cost hedge funds over a ten-year period from 2008 to 2017, when performance is measured on a basis net of fees, costs, and all expenses. See posts here, here and here for past coverage of Buffett’s famous bet.”

In 2000, I wrote in the Financial Times that “the record of failure to predict recessions is virtually unblemished.” In time for Groundhog Day, my colleague Zidong An, Joao Jalles and I have updated my analysis so that it now covers the years 1992 to 2014 and 63 countries. We find that there is little reason to change my assessment. Like Bill Murray, I am reliving the same moment.

FocusEconomics announces the winners of our 2017 Analyst Forecast Awards. “The Awards recognize the most accurate forecasters for the main macroeconomic indicators across 87 countries and 29 commodity prices in 2016. Details of the awards and the list of winners are available at: www.focus-economics.com/awards.”

In a new paper, Daniel Aromi shows that “excessive optimism after the arrival of positive information” for a few years about a country’s prospects can lead to large forecast errors when the information turns negative but forecasts don’t.

“[…] some years before the Asian crisis, Krugman (1994) warned against ‘popular enthusiasm about Asia’s boom’. More recently, Pritchett and Summers (2014) indicate that growth expectations regarding the Chinese and Indian economies might suffer from excessive extrapolation of recent trajectories. In addition to these warnings, further motivation is provided by macroeconomic episodes in which improved economic prospects are followed by crises. For instance, several European economies, among them Greece and Ireland, went through this type of trajectory. Another case is given by recent events in Brazil, where prominent optimism regarding economic prospects was later proven wrong in a stark manner.”

“The empirical analysis shows a significant association between mean forecast errors and earlier information flows. The sign of the documented relationship is consistent with the overreaction hypothesis. More positive information is followed, on average, by higher forecast errors, that is, by increments in the mean difference between forecast growth and realized growth.”

“It is worth noting that the strongest evidence is documented for information flows and forecasts errors that are between 4 and 8 years apart. In other words, the evidence indicates the presence of a process that develops at a frequency that is lower than the usual business cycle frequency.”

“This work documents the presence of systematic errors in growth forecasts. Mean forecast errors are positively associated with the tone of information flows observed in previous periods.”

“The inefficient use of information and the associated errors in decision-making could explain economically significant aggregate fluctuations. In particular, excessive optimism after the arrival of positive information can contribute to the emergence of vulnerabilities that increase the likelihood of economic crises.”

The article is available from the International Finance.