Some anecdata here:

My friends run a mid-sized hair salon, about 8 workstations, on the west side of Tokyo [edit: Kichijoji] and are still operating. They see no reason to close down, haven't been told to close down by anyone, and although their business is down, it's still brisk.

Meanwhile the shops are full of both people and stock (except for loo roll).

Some young people in Tokyo have been returning by shinkansen to their parents' homes in the countryside (which is obviously a dreadfully bad idea). I persuaded my friends not to do that, but they were thinking about it.