Rates were little changed Wednesday in volatile trading. In economic news, the August Producer Price Index (PPI) was unchanged, matching expectations, and was 6.5% higher than one year ago. Core PPI, which excludes food and energy components, rose 0.1%, slightly below forecast. Retail Sales were flat in August. An increase of 0.2% had been expected. The Mortgage Bankers Association weekly purchase activity index rose by 7%, while the refinancing activity index increased by 6%. Average reported 30-year fixed rates fell to 4.17%, not including fees. Results from today’s 30-year Treasury auction will be released at 1:00 PM.