Among the most challenging aspects of shopping for a mortgage is how rates change constantly. It's hard to pin them down. For example, in 2011, mortgage rates have expired every 3-and-a-half hours, on average. That's fast. There's two main catalysts for changing mortgage rates. The first can be grouped as "scheduled events"; the planned release of market data which includes the Existing Home Sales report, or a scheduled government statement such as when the Federal Open Market Committee … [Read more...]