Fractional reserve regimes generate fragile banking, and full reserve regimes (e.g., narrow banking) remove fragility at the cost of suppressing the role of banks as lenders. A Central Bank Digital Currency (CBDC) could provide safe money, but at the cost of potentially disrupting bank lending....

Over the past 70 years, a proposal to narrow the scope of banks has emerged more and more frequently in financial debates and research. Narrow banking would prevent deposit-issuing banks from lending to the private sector and restrict nonbank intermediaries from funding investments with demand...