Relying on theories in which bank create private money by making loans that create deposits—a process we call “funding liquidity creation”—we measure how much funding liquidity the U.S. banking system creates. Private money creation by banks enables lending to not be constrained by the supply of cash deposits. During the 2001–2020 period, 92 percent of bank deposits were due to funding liquidity creation, and during 2011–2020 funding liquidity creation averaged $10.7 trillion per year, or 57 percent of GDP. Using natural disasters data, we provide causal evidence that better-capitalized banks create more funding liquidity and lend more even during times when cash deposit balances are falling or unchanged. Large banks as well as the top banks in Federal Reserve districts create more liquidity.

We develop a model in which credit ratings are endogenously coarse relative to the underlying default probabilities, and ratings precision is countercyclical. Ratings coarseness arises from the profit-maximizing behavior of rating agencies, and coarseness may maximize welfare even when greater ratings precision is costlessly available. Because the private outcome may differ from the socially desirable outcome, a social planner can improve welfare by putting a ceiling (floor) on the rating agency’s fee if the desired outcome is coarseness (precision). Strikingly, when information production is costless, ratings coarseness is socially optimal, but it does not arise in the laissez-faire equilibrium, thus inviting regulatory intervention.

RMBS sponsors contributed to the rise of new product features in securitized mortgages prior to the 2008 financial crisis. Using a regulatory shock to sponsor competition , we show securitization influences the design of mortgage contracts, empirically demonstrating a unique, feedback loop of product differentiation from the derived security (MBS) to the underlying asset (loans). Product differentiation in Prime MBS collateral rises faster than that of non-prime in the early boom period (2000–2004), a strategic choice by MBS sponsors in the face of increasing competition. At very high levels of competition, product differentiation targets non-prime (marginal) borrowers. We develop a theoretical framework for sponsor-induced product differentiation that explains these empirical findings.