This Is Not Science — It Is Witchcraft! Seeing How Bad Econometric Forecasting Is

As for forecasting, a look at the literature on exchange rate economics gives us an idea of how bad econometric forecasting is. We can predict precisely when a falling object will hit the ground and where a projectile will land, but we cannot predict with a reasonable level of confidence whether a currency will appreciate or depreciate on the announcement of unemployment data — that is, we cannot even predict the direction of change, let alone the magnitude of change. I must admit, however, that economists (or applied econometricians) are good at finding explanations for currency appreciation or depreciation in response to the announcement of unemployment data — only after the fact, of course. It all depends on what the researcher wants to prove and if that turns out not to be the case, an explanation is found for why it did not turn out to be the case, sometimes blaming the unwanted results on econometrics itself (such as the low power of the test). This is not science — it is witchcraft.

—Imad A. Moosa, Econometrics as a Con Art: Exposing the Limitations and Abuses of Econometrics (Cheltenham, UK: Edward Elgar Publishing, 2017), 52.