1. In 2020, the pandemics of Coronavirus has caused an unprecedented global economic crisis. For example, in the United States, the Covid-l9 has damaged total national output of this country via several channels, including a supply shock, a demand shock and a historical nancial shock. The inuence of this heath crisis varied by industries and across subsectors within an industry. Suppose, we can use a Cobb-Douglas production function to estimate national output (Y) of the US economy as Y; = AK \"1.1-\