Funding Liquidity Risk

Liquidity crises in financial institutions are often characterized by abrupt funding shortfalls rather than by insolvency in a narrow accounting sense. During such episodes, margin requirements, funding withdrawals, and balance-sheet constraints interact to force deleveraging and asset sales, even when asset fundamentals remain sound. This paper develops a structural framework for analyzing funding liquidity risk at the level of a financial institution, emphasizing the endogenous nature of funding stress. The framework models funding liquidity risk as a balance-sheet constraint linking margin requirements, contractual and behavioral cash outflows, contingent liquidity demands, and the quality of funding sources to effective funding capacity. A central object of the analysis is a funding scarcity variable that summarizes the tightness of the funding constraint and evolves endogenously under stress. The model captures margin spirals and loss spirals as mutually reinforcing mechanisms that amplify liquidity shocks and generate non-linear stress dynamics. By explicitly linking funding scarcity to market liquidity outcomes, the framework explains price dislocations, commonality of liquidity across assets, and flight-to-quality dynamics as equilibrium consequences of constrained intermediation rather than changes in beliefs or fundamentals. The paper further discusses policy and risk management implications, highlighting the limitations of static liquidity ratios and the role of central bank interventions in alleviating funding constraints. A prototype implementation illustrates how the framework can be operationalized for liquidity stress testing and contingency funding planning.