Western Union Co., the world’s biggest money-transfer business, fell after the company forecast continued revenue declines in 2013.

The shares slid 4 percent in extended trading yesterday after Englewood, Colorado-based Western Union reported fourth- quarter results. Net income plunged 47 percent to $237.9 million, or 40 cents a share, from $452.3 million, or 73 cents, a year earlier, the company said in a statement. The average estimate of 28 analysts surveyed by Bloomberg was 35 cents.

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