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In the bond market, the weak U.S. economic data and uncertainty about Greece lit up demand for safe investments. The benchmark 10-year Treasury yield dipped below its lowest closing level in nearly four months.

The yield on the five-year Treasury note hit a record low for the second straight day, falling to 0.71 percent.

Treasury yields have been falling since last week, when the Federal Reserve said it expected to hold interest rates near zero into late 2014, more than a year longer than its last estimate, because the economic recovery will need help.

RadioShack Corp. stock plummeted 28 percent after the company said its profit fell sharply — 11 cents to 13 cents per share for the quarter that ended in December, down from 51 cents a year earlier and less than half what Wall Street was expecting.

Best Buy Co. Inc., one of RadioShack’s competitors, responded by falling 5.2 percent, the worst in the S&P 500. Both companies sell and service cellphones, but demand has softened at their stores.

Among other stocks in the news:

• Mattel Inc. soared 5.2 percent because of strong demand for Barbie and Monster High dolls during the holidays. That increase boosted Mattel’s fourth-quarter profit by a better-than-expected 14 percent. The company also raised its dividend.

• U.S. Steel Corp. gained 4 percent after it reported strong demand for pipes from the oil industry from October through December. The company was also optimistic about this quarter.

• Agriculture conglomerate Archer Daniels Midland declined 4.6 percent after it reported an 89 percent drop in quarterly net income. The company said its results were weighed down by weakness in oil seeds, corn processing and agricultural services.

AP writer Stan Choe contributed to this report.