STOCK AND FUND SCREENERS: Market screener (most active stocks), mutual fund finder, intraday stock screener. ASK MATT ABOUT STOCKS: USA TODAY's Matt Krantz answers your questions daily at money.usatoday.com. By Tim Paradis, AP Business Writer NEW YORK — Stocks ended a volatile week with a moderate gain Friday but mixed for the week after better-than-expected economic data placated a market pummeled a day earlier by concerns about housing and the financial sector. The stock market's volatility during the week — rallying Tuesday and Wednesday only to erase those gains Thursday — illustrates tentativeness behind some of the bets investors are laying, said Hugh Johnson, chairman and chief investment officer of Johnson Illington Advisors. He said the market tends to react to whatever the latest headlines are. "It's just news...
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