[Related to the Apply the Concept: "Will a Black Swan Eat Your 401(k)?"] In early 2020, an article on bloomberg.com discussed the effects of the Covid-19 pandemic on the world oil market. Covid-19 first appeared in the Chinese city of Wuhan in late 2019 and led to significant disruptions to the Chinese economy. The article quoted one financial analyst as saying that the oil industry was "contending with a potential black swan situation." What did the analyst mean by a "black swan situation