To be sure, the IMF has a habit of slashing its outlook for global growth. The fund did so no fewer than a half-dozen times last year in the course of trying to quantify the ultimate impact of trade frictions (among other headwinds) on the global economy. Ultimately, growth was 2.9%, the lowest since the crisis. In the January update, the IMF said growth would rebound in 2020 to 3.3%. That was on the 20th of last month, right around the time the market started to get nervous about the virus.