You are joking obviously. Cash is a ‘safe asset’. Just one that doesn’t reward the saver for creating a paradox of thrift.

This “safe asset” argument is from the same daft argument school as “secular stagnation”. It is entirely from the view of people holding vast quantities of uninvested funds. For some reason they seem to believe that they should be rewarded for slowing the economy down. No those ‘safe assets’ need to be spent, or confiscated. Certainly they don’t need rewarding for it.

And if people don’t want to do that then they get cash at 0% — in a bank.