The business week ahead

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TODAY: U.S. stock and bond markets are closed for the Presidents Day holiday.

TUESDAY: Walmart, the world’s biggest retailer, will report its fourth-quarter financial results, which should signal how its online efforts are doing in competition with Amazon.

WEDNESDAY: The National Association of Realtors releases existing home sales for January. … The Federal Reserve releases minutes from its January interest-rate meeting.

THURSDAY: Mortgage company Freddie Mac releases weekly mortgage rates. The 30-year fixed-rate mortgage rate jumped last week to 4.38 percent — its highest level in nearly four years.