What sets the lower bound on negative interest rates?
Core argument: Interest rates can fall below zero because the lower bound is set by the storage costs of holding physical currency, not by the convenience advantage of bank deposits over cash.
Interest rates can indeed go negative, challenging the assumption that people would simply hold currency instead. The key factor in determining the lower bound of interest rates is not the utility of bank deposits over cash but rather the storage costs associated with holding currency. In a liquidity trap, where interest rates on safe assets are zero or lower, liquidity has no opportunity cost, and people hold money solely as a store of value. This shifts the focus to storage costs as the primary consideration for the marginal holder. The implications are significant for monetary policy, as understanding these dynamics can help policymakers navigate the complexities of negative interest rates and their impact on economic behavior.






