How the major market indexes fared (AP)

Wall Street has managed an advance the hard way — zigzagging on a mix of earnings and economic news Monday before closing moderately higher. The major indexes reversed direction several times, rising in response to Pfizer Inc.

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's $68 billion planned acquisition of Wyeth. And the National Association of Realtors said existing homes rose rather than fell in December. But news from big companies weighed on the market including downbeat comments from Caterpillar Inc . about the health of its business.

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