article · Central Bank Review
An analysis of United States quarterly data spanning 2005 to 2025 demonstrates how monetary policy shifts influence household debt across different time horizons and leverage levels. Using nonlinear wavelet quantile methods, the findings indicate that interest rate rises exert weak short-term impacts but considerably constrain borrowing for highly leveraged households over medium- and long-term horizons. In contrast, expansion of the money supply drives broad debt growth, concentrated primarily among highly indebted groups. Currency depreciation does not alter debt immediately, but it is linked to higher long-term debt accumulation for vulnerable households through imported inflation and liquidity substitution. Additionally, household debt consistently aligns with consumption spending across most timeframes, while capital formation relates to borrowing increases solely in the long term. These interactions show greater persistence and strength at medium-to-long frequencies, providing insights for shaping central bank strategies.
Understanding household debt dynamics is essential for designing monetary policy that maintains financial stability without causing severe economic shocks. Because debt levels dictate how households adjust consumption during interest rate shifts, mapping these time-dependent responses allows authorities to anticipate vulnerabilities, avoid destabilising credit cycles, and better calibrate economic interventions.
This early-stage macroeconomic research provides empirical insights rather than a direct commercial product. Its primary beneficiaries are central bank authorities, financial regulators, and economic policymakers who can use the findings to evaluate monetary tools and manage debt risks. The abstract does not indicate a commercial application pathway or private-sector technology transfer opportunity.
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Central banks must closely monitor household debt because it shapes aggregate spending behaviour and influences how households respond to economic shocks. The macroeconomic effects of such shocks depend not only on the overall level of household indebtedness, but also on the interest-rate sensitivity and maturity structure of household liabilities. High debt exposure can amplify changes in consumption, especially when borrowing costs rise or income conditions weaken. Against this background, this study examines the effect of monetary policy on household debt in the United States using quarterly data from 2005Q1 to 2025Q1. Furthermore, given the nonlinear nature of the variables, we use nonlinear approaches, including wavelet quantile regression (WQR) and wavelet quantile correlation (WQC). The ADF and PP results validate each other, showing evidence of stationarity. The findings reveal that policy interest rate hikes have weak short-run effects but strong, medium- and long-term debt-constraining impacts on highly leveraged households. Conversely, increases in the money supply lead to widespread increases in household debt, particularly for the most highly leveraged households, aligning with liquidity-driven credit cycles. Exchange rate depreciation has no immediate effect on household debt but is positively associated with long-term debt accumulation among highly leveraged households, primarily due to imported inflation and liquidity substitution. Consumption expenditure shows a strong positive co-movement with household debt across most debt quantiles and time horizons, whereas capital formation is linked to increased debt only in the long run. Wavelet quantile coherency estimates confirm these trends, highlighting larger and more persistent co-movements between monetary variables and household debt in the medium-to long-term frequencies. Based on the study's findings, recommendations for practical policy decision-making are derived from the broad research results to guide relevant stakeholders and decision-makers in pursuing more effective monetary policy for managing household debts.
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DOI: 10.1016/j.cbrev.2026.100269
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