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There's an old adage in the mortgage business: "Mortgage markets take the stairs down and the elevator up."  It's supposed to mean that mortgage rates rise faster than they fall.

It turns out the saw has no teeth.

Looking at data from the last 14 months, at nearly every price change delta of consequence, mortgage price improvements outnumbered deteriorations. An "improvement" pushes mortgage rates lower.  A deterioration moves them higher.

• Daily change of 0.2500 : 18 improvements, 8 deteriorations
• Daily change of 0.3125 : 27 improvements, 20 deteriorations
• Daily change of 0.3750 : 4 improvements, 11 deteriorations
• Daily change of 0.4375 : 13 improvements, 10 deteriorations

The trend continues at the higher price change points, of which each is a huge, one-day change in pricing. A 0.500 pricing change can move mortgage rates by as much as a quarter-percent.

• Daily change of 0.5000-0.7500 : 18 improvements, 15 deteriorations
• Daily change of 0.7500-1.000 : 8 improvements, 3 deteriorations
• Daily change of greater than 1.000 : 10 improvements, 11 deteriorations

Another interesting observation is that on the days of nominal price change, the day on which pricing changed by less than 25 basis points, markets tended to worsen.  From this pattern, we can infer that traders want to move mortgage pricing higher but don't have the conviction to make it stick long-term.

Which, of course, brings us to the other well-known saying: "Don't fight the Fed."  So far this year, that saying has held true.

Mortgage rates are based on mortgage-backed securities pricing and I get my data from MBSRateWatch in real-time. If you don't subscribe but need to stay current on rates, follow me on Twitter or on Facebook.  I often post updates when markets are moving and that can mean the difference between getting a good rate and getting a bad one.

Dan Green is an active loan officer. Email or call 513-443-2020. Dan is on Twitter at @mortgagereports.