The Secret History of the Credit Card uncovers the deceptive techniques and tactics used by banks and financial corporations to get citizens to take on ever more debt, while earning record profits. Penalty fees, defaulting, changing contracts, increasing rates retrospectively---these are some of the ways credit card companies gouge their users, and increase influence. The film shows how such profitability of credit cards began in the 1980s, when the banking industry successfully eliminated the limit on the interest rate a lender can charge a borrower. This deregulation, coupled with real-time tracking of personal financial information, facilitated the widening availability of credit cards. Despite a growing number of consumer complaints, the ability of state and local governments to investigate the credit card companies has virtually been eliminated, due to companies incessant lobbying and litigation that has created a jurisdictional "turf battle."