Mortgage rates ended the week little changed from where they started on Monday. Bidding on yesterday’s 30-year Treasury bond auction was considered average, disappointing investors following a better than expected 10-year note auction on Wednesday. No economic data will be released today. The most important data next week will be the Consumer Price Index and Retail Sales for March, both of which come out on Wednesday. Concerns about the economic situation in Greece may add to the volatility in bond and mortgage-backed securities markets.