According to Taleb, black swans are events that emerge unpredictably, like a tornado, from a fat-tailed statistical distribution.

But I argued that financial crises, at least, are more like hurricanes: they are the predictable result of built-up economic and financial vulnerabilities and policy mistakes.

There are times when we should expect the system to reach a tipping point – the "Minsky Moment" – when a boom and a bubble turn into a crash and a bust. Such events are not about the "unknown unknowns," but rather the "known unknowns."

Beyond the usual economic and policy risks that most financial analysts worry about, a number of potentially seismic white swans are visible on the horizon this year. Any of them could trigger severe economic, financial, political, and geopolitical disturbances unlike anything since the 2008 crisis.

For starters, the United States is locked in an escalating strategic rivalry with at least four implicitly aligned revisionist powers: China, Russia, Iran, and North Korea. These countries all have an interest in challenging the US-led global order, and 2020 could be a critical year for them, owing to the US presidential election and the potential change in US global policies that could follow.