Cutting GDP to Counter the Coronavirus Pandemic. Robert Barro, March 26, 2020, Opinion, "One of the main policy responses to the coronavirus pandemic has been to curb economic activity as a way of reducing the contagion’s spread. I would characterize this policy as a decision to reduce U.S. and world GDP in the short run by roughly 20 percent. In essence, this is a voluntarily implemented negative supply shock, akin to a sudden loss in productivity. The world’s annual GDP today is around $100 trillion, so a 20 percent cut sustained for a year would be about $20 trillion, roughly the annual GDP of the United States. For the moment, I assume that it is a good policy choice to engineer this reduction in GDP by $20 trillion worldwide, $4 trillion of which is accounted for by the United States." " Link