Don't Fret Higher Mortgage Rates

NEW YORK ( TheStreet) -- Housing's been hot lately, with ultra-low supply sending prices higher and fueling a wave of construction starts -- a small but noteworthy economic tailwind. Historically cheap mortgages have been a key driver, but now rates are ticking up. Over the past five weeks, weekly 30-year fixed rates have jumped nearly a 0.6 percentage point, leading some to wonder how higher borrowing costs will impact the housing markets.

In our view, higher mortgage rates could potentially help housing markets sustain their largely underappreciated run. And as investors notice and sentiment continues improving, stocks could get a nice boost, too.

Even with the recent uptick, mortgage rates remain near generational lows, as shown in Exhibit 1. For high-quality borrowers, mortgages are still cheaper than at almost any point since 1971 -- and cheaper than they were during some very strong periods for U.S. home sales. Thus, demand should likely remain firm.

Exhibit 1: 30-Year Fixed Mortgage Rates (Monthly Average)

Source: Freddie Mac, as of June 3, 2013

Higher rates, however, likely do impact the supply side. One big driver of banks' willingness to lend is their net interest margin -- essentially the potential profit on the next loan made. Net interest margins have shrunk since 2010 and are near their lowest point in recent history, as shown in Exhibit 2.

Exhibit 2: Average Net Interest Margin of All Commercial Banks

Source: FDIC, as of June 6, 2013

This is largely due to the Fed's quantitative easing program. By purchasing long-term Treasuries and agency mortgage-backed securities, the Fed has pulled down long-term rates.

In a more normal environment -- i.e., an environment without Fed intervention -- short rates could fall in sympathy, keeping the margin between the two more or less intact. But the Fed has pegged short rates near zero, so falling long rates means a smaller gap between the two -- and less potential profit on the next loan made. That diminishes banks' incentive to lend.

Higher rates, however, likely widen banks' net interest margins, which could motivate them to lend more enthusiastically. (Hence, why we'd welcome the tapering or end of quantitative easing.) And if mortgage supply rises while demand stays strong, housing's run should continue.

Of course, since residential real estate's only 2.6% of the U.S. economy (as of fourth-quarter 2012), housing strength isn't a huge economic driver. It's simply too small.

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