NEW YORK—Wall Street showed some signs of stability Tuesday as investors, heartened by government plans to aid consumer lending companies, selectively bought more stocks following a huge two-day rally. Gains in blue chips gave the Dow Jones industrials and the Standard & Poor’s 500 index their first triple-session advance in more than two months.

Tech stocks lagged the market, sending the Nasdaq composite index lower, as investors bet that businesses will continue slashing capital spending in a recession. Some selling was widely expected after a two-day rally that sent the Dow up n...

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