Heads up: December arrives this week and that's usually good news for investors. December has been the best-performing month for the Dow...

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Heads up: December arrives this week and that’s usually good news for investors. December has been the best-performing month for the Dow and S&P 500 since 1950, averaging gains of 1.8 and 1.7 percent respectively, according to The Almanac Investor.

Why? A lot of reasons, including a “buying bias” by NYSE members and brokerages, and the “Santa Claus Rally.”

But how much of a drag will the cooling housing market have on stocks? We’ll find out this week when the latest monthly figures on existing home sales are released Monday and new-home sales data is reported Tuesday.

Also out Tuesday are the monthly numbers on durable goods orders and the Consumer Confidence Index. Wednesday brings the third-quarter report on gross domestic product and the Federal Reserve’s survey of regional economic conditions, also known as its “beige book.”

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Monday: T-Mobile USA is back in King County Superior Court with Sue Swenson, its former chief operating officer who left the wireless company to work at Los Angeles-based Amp’d Mobile. The judge will set a bond amount for the upcoming trial to sort out Swenson’s noncompete clause with her former employer.