Overconfidence in the Credit Card Market

High credit card debt default has been symptomatic for the U.S. and other countries in the last decades. Different explanations for this situation exist in the literature. One explanation is overconfidence, which has become a key concept in behavioural economics for explaining anomalies in financial markets such excessive trading volume. There is also the idea that overconfidence is to blame for high credit card debt. In this paper, an agent-based model is presented that examines the effects of overconfidence on credit card usage. Overconfidence is used here to explain why people who never intend to borrow on their credit card(s) do so anyway.The model contains consumption, two means of payment (credit card and cash), and a distortion to agents' income expectations via overconfidence. It was found that overconfidence leads to more “accidental” borrowing and higher interest rates.