Category Archives: IMF

19/10/18: IMF’s Woeful Record in Forecasting: Denying Secular Stagnation Hypothesis


A recent MarketWatch post by Ashoka Mody, @AshokaMody, detailing the absurdities of the IMF growth forecasts is a great read (see https://www.marketwatch.com/story/the-imf-is-still-too-optimistic-about-global-growth-and-thats-bad-news-for-investors-2018-10-15?mod=mw_share_twitter).  Mody's explanation for the IMF forecasters' failures is also spot on, linking these errors to the Fund's staunch desire not to see the declining productivity growth rates (aka, supply side secular stagnation).

So, to add to Mody's analysis, here are two charts showing the IMF's persistent forecasting errors over the last four years (first chart), set against the trend and the cumulative over-estimate of global economic activity by the Fund since mid-2008 (second chart):




While the first chart simply plots IMF forecasting errors, the second chart paints the picture fully consistent with Mody's analysis: the IMF forecasts have missed global economic activity by a whooping cumulative USD10 trillion or full 1/8th of the size of the global economy, between 2008 and 2018. These errors did not occur because of the Global Financial Crisis and the high degree of uncertainty associated with it. Firstly, the forecasting errors relating to the GFC have occurred during the period when the crisis extent was becoming more visible. Secondly, post GFC, the hit rates of IMF forecasts have deteriorated even more than during the GFC. As Mody correctly points out, Fund's forecasts got progressively more and more detached from reality.

At this stage, looking at April and October 2018 forecasts from the Fund's WEO updates implies virtually zero credibility in the core IMF's thesis of a 'soft landing' for the global economy over 2019-2021 time horizon.

19/10/18: IMF’s Woeful Record in Forecasting: Denying Secular Stagnation Hypothesis


A recent MarketWatch post by Ashoka Mody, @AshokaMody, detailing the absurdities of the IMF growth forecasts is a great read (see https://www.marketwatch.com/story/the-imf-is-still-too-optimistic-about-global-growth-and-thats-bad-news-for-investors-2018-10-15?mod=mw_share_twitter).  Mody's explanation for the IMF forecasters' failures is also spot on, linking these errors to the Fund's staunch desire not to see the declining productivity growth rates (aka, supply side secular stagnation).

So, to add to Mody's analysis, here are two charts showing the IMF's persistent forecasting errors over the last four years (first chart), set against the trend and the cumulative over-estimate of global economic activity by the Fund since mid-2008 (second chart):




While the first chart simply plots IMF forecasting errors, the second chart paints the picture fully consistent with Mody's analysis: the IMF forecasts have missed global economic activity by a whooping cumulative USD10 trillion or full 1/8th of the size of the global economy, between 2008 and 2018. These errors did not occur because of the Global Financial Crisis and the high degree of uncertainty associated with it. Firstly, the forecasting errors relating to the GFC have occurred during the period when the crisis extent was becoming more visible. Secondly, post GFC, the hit rates of IMF forecasts have deteriorated even more than during the GFC. As Mody correctly points out, Fund's forecasts got progressively more and more detached from reality.

At this stage, looking at April and October 2018 forecasts from the Fund's WEO updates implies virtually zero credibility in the core IMF's thesis of a 'soft landing' for the global economy over 2019-2021 time horizon.

22/6/18: ‘Skeptical’ IMF tends to be over-optimistic in its U.S. growth forecasts


In recent weeks, the IMF came under some criticism for posting relatively gloomy forecasts for the U.S. economy, especially considering the White House rosy outlook that stands out in comparison. see for example, WSJ on the subject here: https://www.wsj.com/articles/imf-sees-u-s-potential-growth-at-half-the-pace-of-white-house-estimates-1528995732.

Which begs two questions:

  1. Does IMF have any grounds to stand on its forecasts divergence from the White House? and
  2. Are IMF forecasts for the U.S. economy actually any good?
Firstly, the grounds:



Per above chart, the IMF is not alone in being less than exuberant about forward growth forecasts for the U.S. In fact, it is White House that appears to be an outlier when it comes to 2020-2023 outlook.

Secondly, per the question above, I crunched through IMF's semi-annual forecasts releases from April 2013 on (period prior to 2013 is too volatile in terms of overall fundamentals to take any forecast errors seriously). The chart below summarizes these against the actual outrun:

On the surface, it appears that IMF forecasts in recent years carried massive errors compared to outrun. So I did a little more digging around. I took 1, 2, 3, and 4 years-ahead forecasts, averaged them over different forecast releases, and estimated 90 and 95 percent confidence intervals for these. Here is the resulting chart:
What does the data tell us? It says that IMF forecasts have, on average, overstated actual growth outrun. In other words, IMF forecasts have been over-optimistic, not excessively pessimistic, in the recent past. More that that, IMF's current (April 2018 WEO release) forecast for the U.S. GDP growth is even more optimistic than already historically optimistic tendencies of the Fund imply. In other words, even though the first chart above shows the IMF forecast for the U.S. growth to be pessimistic, compared to that of the White House, in reality, IMF's forecasts tend to be wildly optimistic.

Average error for 1 year ahead forecast for the U.S. in IMF releases has been 0.037 percentage points (very small), rising to 0.476 percentage points for 2 years ahead forecasts (more material error), and 0.867 percent for 3 years ahead forecasts. Augmenting data (to achieve larger number of observations to 2000-2006, 2011-2014 periods, 4 years ahead average forecasts has been 0.867 percentage points above the outrun growth. And so on.

So, to summarize:

  1. IMF is not unique in being less optimistic on the U.S. economy than the White House;
  2. IMF's history of forecast errors suggests that the Fund tends to be overly optimistic in its forecasts and that current official Fund forecasts are more likely to be reflective of significant over-estimation of future growth than under-estimation;
  3. IMF's forecasts more than 1 year out should be treated with some serious caution - something that applies to all forecasters.