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Global equity markets may have underestimated the economic effects of a potential COVID-19 pandemic because the only historical parallel to it is the 1918 flu pandemic (which is likely worse than COVID-19 due to a higher fatality rate) and stock markets didn't drop that much. But maybe traders haven't taken into account (and I just realized this) that there was war-time censorship in effect which strongly downplayed the pandemic and kept workers going to factories, which is a big disanalogy between the two cases, so markets could drop a lot more this time around. The upshot is that maybe it's not too late to short the markets.
It feels like your background should be attributed differently than things like the Saudi-Russian spat, or the artificially deflated VIX. In Zvi's terminology this is an Unknown Known; it isn't as though you weren't updating based on it. It was merely an unarticulated component of the prior.