Lamarr and Anthiel received a patent in 1941, but the enormous significance of their invention was not realized until decades later. It was first implemented on naval ships during the Cuban Missile Crisis and subsequently emerged in numerous military applications.
Cash back credit card reward programs started out rather simply, offering a flat percentage rate (typically 1 percent of purchases) rebated back to the customer in the form of a check at the end of the year or a statement credit.
The Citi Double Cash Card is the best overall cash back credit card. So long as you pay your statement balance in full and on time every month, you will earn 2% cash back. You earn 1% unlimited cash back on all of your purchases. You then earn an additional 1% on payments based on your purchases.