Economics is a quantitative science. How many elderly teachers are there? You know, how many not elderly teachers maybe live with their parent or have an elderly spouse at home)? We can calculate and I wrote a paper calculating these kinds of things. And yes, there were even if I acknowledge that there would be some extra deaths by having schools open,. They would be quite rare compared to all the lost human capital among the children. So that's a very strong economic case for having the schools open.