Mortgage rates were little changed Wednesday in quiet trading. In economic news, the August Producer Price Index (PPI) rose 0.2%, below the consensus forecast for an increase of 0.3%, and was 2.4% higher than one year ago. Core PPI, which excludes volatile food and energy components, rose 0.1% and was 2.0% higher year-over-year. Results from today’s 30-year Treasury auction will be released at 1:00 PM.