Mortgage rates were little changed Monday, with no economic data scheduled for release today. Trading volume is typically very light in the final two weeks of December, as most investors have closed their books for the year. Final third quarter GDP figures will be released tomorrow, along with New and Existing Home Sales. Durable Goods Orders for November will be reported Wednesday. Refinance volume has slowed in recent days due to an increase in mortgage rates from 45-year lows reached last week.