Delinquencies in car loans and credit card debt have risen in recent years. Is this a red flag for the U.S. economy?When debt loads get too high to be smoothly serviced, consumers will make selective choices on which bills to pay first and which to delay. Blu Putnam, Chief Economist at CME Group, discusses the evolving pattern of loan delinquencies and whether rising consumer debt loads pose a threat to the U.S. economy.