By the end of 2015 Americans had collectively built up US$1.2 trillion in student debt, more than triple the amount from a decade earlier, and have the worst delinquency rates in consumer credit. Credit analysts at Equifax estimate that more than one in ten student loans were over 90 days overdue as of November, reports the Financial Times. The biggest financial problems affect poorer Americans who took out smaller loans for courses at less prestigious institutions, leading the Consumer Financial Protection Bureau to warn the student debt situation bears hallmarks of the toxic mortgage loans that triggered the 2008 meltdown. The head of US Treasury trading at JP Morgan Chase, Andrew Lombara, and Chi Lee, a junior Treasury trader, both left the bank in early January without a public disclosure of the reasons. Citing "people familiar with the matter," the Financial Times suggests the JPMorgan traders wanted to increase the size of the reserves set aside for certain Treasury trades known as strips (or "separate trading of registered interest and principal of securities") and went around the valuation committee to do so. JPMorgan believed this subsequent move violated internal bank procedures and therefore fired the traders, according to the FT's sources.