| I've always heard that the percentage of people who carry a balance is around 50%. In fact, here's a source that claims the same thing (taken from near the end of the article in the link below) Prevalence of credit card debt · Credit Card Debt has increased significantly in the past decade. Credit card debt has increased by 25 percent in the past 10 years, and reached $963B in January 2009. (Federal Reserve 2009) · More than three-quarters of families have credit cards and close to half carry a balance. Seventy-eight percent of U.S. families have a credit card, and 44 percent of families carried a balance on their credit card. (Nielsen 2008, Federal Reserve 2008) · Families carry significant credit card debt. The average amount of credit card debt among families with a balance was $7,300 in 2007 (the median was $3,000). (Federal Reserve, 2008)
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Here is a link that might be useful: Article about credit cards