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Why Mainstream Economic Forecasts Are So Often Wrong

(Mises Institute) Every end of the year, by the end of the year, we receive numerous estimates of global GDP growth and inflation for the following year. Historically, almost in all cases, expectations of inflation and growth are too optimistic in December for the following year.

If we look at the track record of central banks, it is particularly poor in predicting inflation, while large supranational entities tend to err on the side of optimism in GDP estimates. The international Monetary Fund or the Organisation for Economic Co-operation and Development, for example, have been particularly poor at estimating recessions, but mostly accurate at making long-term trend estimates. Contrary to popular belief, it seems that most forecasts are better at identifying long-term economic dynamics than short-term ones.

Forecasting is a dirty job, but somebody has to do it. Economic forecasting is exceedingly difficult because there are numerous factors that can drastically change the course of a global economy that is increasingly complex and subject to important uncertainties. However, macroeconomic forecasting is also essential to provide a frame of reference for investors and policymakers. It should not be considered the revealed truth nor entirely dismissed, just an important framework that allows us to at least identify the major points of discrepancy as well as the areas to look at for positive or negative surprises as the year unravels. Yes, macroeconomic forecasting is essential.

The first lesson is that independent forecasts are almost every year more accurate than those of supranational bodies and central banks. There is a logic behind it. Independent forecasters do not feel the political pressure to use a benign view of government policies in their estimates. This is one of the main reasons why investors increasingly use their own economic forecasting teams alongside truly independent firms.

While it is always worth paying attention to investment banks and international bodies’ forecasts, most investors have learned to understand that the estimates of these large entities are often blurred by political correctness and a tendency to be overly diplomatic. Notice how even in countries where governments have destroyed the economy with wrong policies, one-year-ahead forecasts tend to be diplomatically optimistic.

The second lesson, particularly after years of financial repression, is that most forecasts tend to assume an optimistic and extraordinary multiplier effect from government spending and central bank stimulus plans. In most cases, when we look at the estimates of large central banks and international entities, the biggest mistakes in forecasting come from expecting a surprisingly large positive impact on consumption, growth, employment, and investment from demand-side policies. In my experience, the two largest divergences between forecast and reality tend to appear in capital expenditure (capex) and inflation.

This is not a coincidence. When the forecaster places too much weight on demand-side policies while ignoring the accumulated debt, overcapacity, and poor track record of most of these measures, the mistakes in capex and inflation forecasts are almost inevitably going to be enormous and much larger than the mistakes on output and employment. Likewise, the tendency of large forecasting entities of ignoring or dismissing supply-side policies leads to forecast errors on the side of caution. This was particularly evident in the recovery of some eurozone countries in 2014 and in the estimates for jobs and growth of 2018–19 in the United States. One of the clearest examples is the almost annual slump in growth in the eurozone relative to early estimates.

The third lesson is that forecasts tend to be significantly more accurate when negative news is already consensus. Even when considering risks that may erode significantly the estimates for the next year, large entities tend to consider a lower probability of occurrence of those events in order to maintain a “positive” outlook. There are still too many politicians and economists who believe that the economy is a matter of sentiment and animal spirits and that, as such, one should maintain a healthily optimistic outlook to support the economy. This has obviously been debunked by reality. Being too optimistic has impacted the credibility of very valuable forecasts while doing nothing to lead economic agents to see a brighter prospect in a recession.

In the past nine years we have seen important improvements in economic forecasting. Some investment banks have stepped out of their historical role of painting rosy outlooks where next year is always a “this time is different” story, and we have seen a more realistic approach. Unfortunately, there is still an eyebrow-raising tendency to end global outlook reports with the same recommendations every year: carry trade your way into the next twelve months.

International bodies have also improved. We have are seeing a much more realistic approach to forecasting than ten years ago, but inflation and GDP estimates still err on the side of figures that governments will be happy with. However, the intense and rising pressure from governments that these bodies are receiving is actually a sign that forecasting is becoming more independent.

The final lesson for us as investors is simple: take with a pinch of salt those estimates that place too much positive impact on government and central bank stimuli…

We must also remember that mainstream bodies are almost entirely populated by Keynesian economists, and there is a tendency to adopt the messages of pressure groups in the economic debate, as we are witnessing with things like the Great Reset, the whitewashing of MMT (modern monetary theory) and the adoption of concepts like inequality, stakeholder investment, and social spending in ways that are uncomfortably close to the political agendas of some interventionist parties.

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