* We don't have infinity, or sufficiently large numbers of companies to do this * We don't have the resources to test sufficiently large numbers of companies l

* We don't have infinity, or sufficiently large numbers of companies to do this * We don't have the resources to test sufficiently large numbers of companies like this * The dependent variable in question is going to be entirely dependent on the number of people infected at a company at the beginning of the study, which is unknowable unless you can test everyone... which we can't.