Warwick Business School
University of Warwick
Institutional Affiliation: University of Warwick
NBER Working Papers and Publications
|February 2019||How Do Americans Repay Their Debt? The Balance-Matching Heuristic|
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In Gathergood et al. (2019), we studied credit card repayments using linked data on multiple cards from the United Kingdom. We showed that individuals did not allocate payments to the higher interest rate card, which would minimize the cost of borrowing, but instead made repayments according to a balance-matching heuristic under which the share of repayments on each card is matched to the share of balances on each card. In this paper, we examine whether these results extend to the United States using a large sample of TransUnion credit bureau data. These data do not have interest rates, so we cannot examine the optimality of payments. However, we observe balances and repayments, so we can examine balance-matching behavior. We replicate our analysis and find that Americans also repay their ...
|Naïve *Buying* Diversification and Narrow Framing by Individual Investors|
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We provide the first tests to distinguish whether individual investors equally balance their overall portfolios (naïve portfolio diversification—NPD) or engage in naïve buying diversification (NBD)—equally balancing values in same-day purchases of multiple assets. We find NBD in purchases of multiple stocks, and in mixed purchases of individual stocks and funds. In contrast, there is little evidence of NPD. So investors seem to narrowly frame their buy-day decision. Simulation analysis suggests that NBD substantially reduces investor welfare. These findings suggest that behavioral finance theory should incorporate transactional as well as portfolio framing.
|December 2017||How Do Individuals Repay Their Debt? The Balance-Matching Heuristic|
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We study how individuals repay their debt using linked data on multiple credit cards. Repayments are not allocated to the higher interest rate card, which would minimize the cost of borrowing. Moreover, the degree of misallocation is invariant to the economic stakes, which is inconsistent with optimization frictions. Instead, we show that repayments are consistent with a balance-matching heuristic under which the share of repayments on each card is matched to the share of balances on each card. Balance matching captures more than half of the predictable variation in repayments and is highly persistent within individuals over time.
Published: John Gathergood & Neale Mahoney & Neil Stewart & Jörg Weber, 2019. "How Do Individuals Repay Their Debt? The Balance-Matching Heuristic," American Economic Review, vol 109(3), pages 844-875. citation courtesy of