>How would fiscal stimulus help a market that is seizing up due to reducing supply side (factories close) and reducing demand side (pubs to be closed, airlines crashing because of border closures, & more) and a disease that is likely to stress many countries medical provisions to breaking point, and then beyond.

If we literally hand money to people, they can pay their bills on time while we work through this thing.

I'm not sure what else will work at this point.

It's not feasible to simply have "rent holidays" or some such, as the OP suggests, as that rent expense is someone else's income.