A new study from the Federal Reserve Bank of Boston says that credit card reward programs have a sneaky hidden cost that the card holder doesn’t have to bear. This occurs because the fee that a retailer pays to run a credit card varies with every card, and reward cards cost more to process–in other words, the card issuer passes the cost of the rewards program on to the retailer. The retailer adapts by raising prices across the board, which distributes the cost of the reward program among all shoppers. [More]