FILE - This Tuesday, Oct. 17, 2017, file photo shows a "House for Sale by Owner" sign in a yard in Fort Washington, Pa. On Wednesday, Dec. 20, 2017, the National Association of Realtors reports on sales of existing homes in November. (AP Photo/Matt Rourke, File)

FILE - This Tuesday, Oct. 17, 2017, file photo shows a "House for Sale by Owner" sign in a yard in Fort Washington, Pa. On Wednesday, Dec. 20, 2017, the National Association of Realtors reports on sales of existing homes in November. (AP Photo/Matt Rourke, File)

WASHINGTON (AP) — Americans purchased homes at the fastest pace in nearly 11 years, as sales climbed 5.6 percent in November.

The National Association of Realtors said Wednesday that sales of existing homes rose last month to a seasonally adjusted annual rate of 5.81 million units. Home sales were last this strong in December 2006, when properties sold at annual pace of 6.42 million.

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The strong demand for buying homes is a sign of an increasingly vibrant economy after a steady, eight-year expansion. The unemployment rate has fallen to a 17-year low, while more people in the younger millennial generation appear to be forming their own households and looking for places to buy. Yet the demand has done little to resolve an increasing vulnerability of the U.S. real estate market as the number of listings has been declining on a yearly basis for two-and-a-half years.

The shortage is a concern, but not necessarily enough to derail the sales momentum.

“The housing market is on relatively stable ground, despite the ongoing inventory squeeze and difficult conditions for buyers at the lower ends of the market in particular,” said Aaron Terrazas, a senior economist at the real estate company Zillow.

In November, there were 1.67 million properties for sale, a 9.7 percent decline from a year ago. There is only 3.4 months’ supply of homes on the market, the lowest level ever tracked by the Realtors.

The limited inventory has caused home values to rise faster than wages. The median home sales price increased 5.8 percent from a year ago to $248,000 in November. That price increase is more than double the rise in average hourly earnings, meaning that some Americans may be priced out of homeownership.

Sales rose last month in the Northwest, Midwest and South. But they fell in the West, where homes cost more and the price appreciation has been the most extreme.

Offsetting some of the cost pressures have been relatively low mortgage rates.

The average rate on 30-year fixed-rate U.S. mortgages was 3.93 percent last week, slightly better than the 4.16 percent rate a year ago, according to mortgage buyer Freddie Mac.