Syndication increases the overlap of bank loan portfolios and makes them more vulnerable to contagious effects. We develop a novel measure of bank interconnectedness using syndicated corporate loan portfolios, overlap based on industry and region, and different weights such as equal weights, size and relationships. We find that interconnectedness is driven mainly by bank diversification, less by bank size or overall loan market size. Interconnectedness is positively correlated with different bank-level systemic risk measures including SRISK, DIP and CoVaR, and such a positive correlation mainly arises from an elevated effect of interconnectedness on systemic risk during recessions. Overall, our results highlight that institution-level risk reduction through diversification ignores the negative externalities of an interconnected financial system.

We investigate whether the introduction of fixed-price U.S. federal deposit insurance in 1933 increased the risk-taking of banks over the succeeding period. We examine 60 financial institutions and find that banks and trusts in general became more risky after the introduction of deposit insurance. However, a subset of well-performing banks appears to have reduced their risk. Deposit insurance also reduced the incentives of depositors to discriminate between ex ante weaker and stronger banks thus reducing depositor discipline in return for greater banking system stability.

Recent research finds that poorer individuals make financial mistakes when the decisions are difficult and rare. We examine who makes financial mistakes involving decisions that are easier and more frequent – specifically, the inadvertent failure to pay monthly credit card balances when sufficient funds are available. On the one hand poorer individuals may make such mistakes because of lower levels of financial literacy. Alternatively, richer individuals may make such mistakes because of the relatively lower costs to them of such mistakes. We examine this question using confidential individual credit card statement data, with over a million data points. Our results show that poorer individuals are more likely to make these mistakes, even after controlling for education.

This paper is the first in the literature to examine the determinants of US credit card penalty fees. Many critics of credit card fees – including a number of US Senators – have argued that credit card penalty fees reflect banks’ market share. Using a unique data set we find that fees are increasing in customer risk which supports the position of defenders of penalty fees, such as banks. However, our finding that fees are increasing in a bank's market share is consistent with the concerns expressed by politicians and regulators. We also find card penalty fees are direct substitutes for card interest rates.

One of the most dramatic trends in banking since the 1980s has been the secular movement away from core banking and interest generating activities towards enhanced reliance on non-interest-generating activities that focus largely on fees and trading profits. In this paper, we draw on a dataset covering nearly a million quarterly observations on more than 12,000 US banks and find no evidence that this shift in the bank business model harms bank profitability. To the contrary, a higher share of non-traditional bank income is associated with a higher profitability. The increase in profitability does not seem to come at the cost of substantially larger bank-level risk taking, at least not for large banks, which are the banks mostly involved in non-traditional bank business. There is also no conclusive evidence that a larger share of non-traditional income is associated with a larger contribution to systemic risk. The net benefits of non-traditional income increased in the 2000s, when both interest rates and bank margins started to decline. Estimation techniques that mitigate endogeneity concerns resulting from unobserved heterogeneity also show larger net benefits associated with greater bank reliance on generating non-traditional income.