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" ... Covid-19 is a contagious disease. This means that it grows (or declines) multiplicatively. A disease with a reproduction number, designated R, around two will grow in four generations from one case (the first generation or index cases) to two cases (the second general) to four cases (the third generation) to eight cases (the fourth generation). A disease with a reproduction number around three will grow much faster from one case (the first generation) to three cases (the second general) to nine cases (the third generation) to twenty-seven cases (the fourth generation). The total size of the epidemic is the sum of the number of cases in each generation, i.e. 1+3+9+27=40 in the example. This multiplicative property is often referred to as exponential growth and has implications for how you should be looking at Covid-19 data. ... "