Paola Boel

We investigate the welfare-increasing role of credit and banking at zero interest rates in a microfounded general equilibrium monetary model. Agents differ in their opportunity costs of holding money due to heterogeneous idiosyncratic time-preference shocks. Without banks, the constrained-efficient allocation is never attainable, since impatient agents always face a positive implicit rate in equilibrium. With banks, patient agents pin down the borrowing rate and in turn enable impatient agents to borrow at no cost when the inflation rate approaches the highest discount factor. Banks can therefore improve welfare at zero rates, provided that both types of agents are included in the financial system and that the borrowing limit is sufficiently lax. The result is robust to several extensions.

We study the redistributive effects of expected inflation in a microfounded monetary model with heterogeneous discount factors and collateral constraints. In equilibrium, this heterogeneity leads to borrowing and lending. Model assumptions also guarantee a tractable distribution of money and capital holdings. Several results emerge from our analysis. First, in this framework expected inflation is detrimental to capital accumulation. Second, expected inflation affects borrowing and lending when collateral constraints are present, thus also inducing redistributive effects through credit. Third, we find this channel to be regressive when we calibrate our model using US data. This is because the drop in borrowers’ capital caused by inflation is larger when capital is used as collateral.

Should policymakers aim to expand access to bank accounts? When financial exclusion is due to frictions that prevent banking from operating efficiently, intervention may be justified. Applying simple economic principles, we highlight possible frictions that may give rise to inefficient exclusion in the United States, and we assess their importance using insights from data and the academic and policy literature.

We review the recent literature on the causes and consequences of financial exclusion—that is, the lack of bank account ownership—in the United States. We examine existing work in a range of fields, including economics, finance, public policy, and sociology.