There are two typical indexes that Adjustable rate mortgages are tied to. One is the London interbank offered rate (libor) and the other is U.S treasuries. When a lot of mortgages were unwritten in the last few years, these two indexes tracked each other closely. Following the financial turmoil which largely began in 2007, these two rates diverged. The libor began to reflect risk premiums and the lack of liquidity. U.S treasuries reflected a flight to quality in the face of great uncertainties.
Mark Schweitzer and Guhan Venkatu at the Federal Reserve Bank of Cleveland publish a nice short paper about how this changes mortgage payments when using these different indices. They use their region of Ohio for the data sample. They break it down for typical prime and subprime loans. In some cases, these differences barely matter and in other cases may translate into a monthly payment of $100 more for every $100,000 of remaining principal for subprime borrowers. Fore prime borrowers, it matters less at nearly $50. Mortgage holders with notes tied to treasuries are able to enjoy lower rates. Lowering the spread between Libor and Treasury rates will help homeowners with libor tied mortgages.
There are some nice exhibits in this paper so take a look at the online version if this has sparked your curiosity. Click here for the study.



