Don Dutkowsky, professor of economics, was interviewed for the WalletHub article, "Best Cash Back Credit Cards." "Theoretically, cash back should be the best rewards currency, since the rewards can be used practically anywhere," says Dutkowsky. "But that only holds when the value of the rewards (for a given amount of purchases) of cash back and product/service-based rewards (e.g., airline miles, automobile discounts) are the same." 09/21/17