Paper: arXiv 2407.01539

Authors: Bo Li

Abstract

This paper provides the first causal evidence that credit supply expansion caused the 1999-2010 U.S. business cycle mainly through the channel of household leverage (debt-to-income ratio). Specifically, induced by net export growth, credit expansion in private-label mortgages, rather than government-sponsored enterprise mortgages, causes a much stronger boom and bust cycle in household leverage in the high net-export-growth areas. In addition, such a stronger household leverage cycle creates a stronger boom and bust cycle in the local economy, including housing prices, residential construction investment, and house-related employment. Thus, our results are consistent with the credit-driven household demand channel (Mian and Sufi, 2018). Further, we show multiple pieces of evidence against the corporate channel, which is emphasized by other business cycle theories (hypotheses).

Complexity vs Empirical Score

  • Math Complexity: 3.0/10
  • Empirical Rigor: 8.0/10
  • Quadrant: Street Traders — practical and empirical, lighter on theory

Why this score: The paper provides strong causal empirical evidence on the household leverage cycle during the Great Recession using spatial and credit market data. While mathematical theoretical modeling is low, the empirical econometrics methodology is rigorous and directly tests competing macroeconomic hypotheses.

Research Flowchart

  flowchart TD
    A[Research Goal: Causal Effect of Credit Supply Expansion on Household Leverage & Business Cycle] --> B[Data Inputs: US Household Leverage, Mortgages & Local Economic Indicators 1999-2010]
    B --> C[Methodology: Causal Inference / IV Strategy Using Net Export Growth]
    C --> D[Analysis: Private-Label vs. GSE Mortgages Impact on Household DTI]
    C --> E[Alternative Hypothesis Testing: Corporate Channel Evaluation]
    D --> F[Key Outcome 1: Private-Label Credit Expansion Drove Stronger Household Leverage Boom-Bust Cycle]
    D --> G[Key Outcome 2: Stronger Leverage Cycles Heightened Local Housing Prices, Construction & Employment]
    E --> H[Key Outcome 3: Evidence Disproves Corporate Channel, Supporting Credit-Driven Demand]