Discussion Paper Details

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Title: Consumer Credit with Over-Optimistic Borrowers

Author(s): Florian Exler, Igor Livshits, Jim MacGee and Michèle Tertilt

Publication Date: December 2020

Keyword(s): bankruptcy, Consumer credit, Cross-subsidization, financial literacy, Financial Mistakes, financial regulation, Over-Optimism and Type Score

Programme Area(s): Macroeconomics and Growth and Public Economics

Abstract: There is active debate over whether borrowers' cognitive biases create a need for regulation to limit the misuse of credit. To tackle this question, we incorporate over-optimistic borrowers into an incomplete markets model with consumer bankruptcy. Lenders price loans, forming beliefs - type scores - about borrowers' types. Since over-optimistic borrowers face worse income risk but incorrectly believe they are rational, both types behave identically. This gives rise to a tractable theory of type scoring as lenders cannot screen borrower types. Since rationals default less often, the partial pooling of borrowers generates cross-subsidization whereby over-optimists face lower than actuarially fair interest rates. Over-optimists make financial mistakes: they borrow too much and default too late. We calibrate the model to the US and quantitatively evaluate several policies to address these frictions: reducing the cost of default, increasing borrowing costs, imposing debt limits, and providing financial literacy education. While some policies lower debt and filings, they do not reduce overborrowing. Financial literacy education can eliminate financial mistakes, but it also reduces behavioral borrowers' welfare by ending cross-subsidization. Score-dependent borrowing limits can reduce financial mistakes but lower welfare.

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Bibliographic Reference

Exler, F, Livshits, I, MacGee, J and Tertilt, M. 2020. 'Consumer Credit with Over-Optimistic Borrowers'. London, Centre for Economic Policy Research.