How Market Position Shapes Credit Card Interest Rates
Why is it that two borrowers who look much alike can be offered very different rates when applying for a credit card? In a recent paper, we address this question by examining how the rate offered changes when the lender’s funding cost falls. Data on 14 million newly issued cards show that when a lender’s funding costs decline, the lender passes less of that decline on to the offer rate when it holds a large market share. That is, two borrowers with similar credit scores and incomes borrowing from the same lender can see noticeably different interest rates on the credit card they are applying for.
Same Shock, Different Roads? A K‑Shaped Pattern at the Pump
In March 2026, energy prices surged to a four-year high, driven by the Iranian closure of the Strait of Hormuz amid the ongoing conflict in the Middle East. In this Liberty Street Economics post, we use the new consumer spending module of the Economic Heterogeneity Indicators to analyze recent changes in nominal and real gas consumption across different income groups. We find that households had very different experiences with gasoline spending: in March, high-income households increased nominal spending the most and kept real consumption essentially unchanged, while low-income households decreased real consumption of gasoline but still saw sharply increased nominal spending because of the rise in gas prices. Therefore, with the sharp increases in gasoline prices in March, a K-shaped pattern in gasoline consumption emerged—showing faster consumption growth for high-income households relative to low-income households. These gasoline consumption patterns qualitatively match those following the increase in energy prices at the beginning of the Russia-Ukraine war in spring 2022, even though the gap in consumption trends during the current episode is quantitatively larger.
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