I understand why you would want to set interest rates negative if your central bank is going to buy up all that debt, but as an individual or institutional investor why would you ever want to hold something with negative interest instead of cash? Why is there even a market for a bond with negative interest rates at all, since compared to a $X bond with negative interest, $X in currency seemingly carries less risk, mo…
This applies whether you are a person with a wallet/mattress, or a bank with a high security vault.