Stocks wavered Tuesday as investors awaited earnings reports from U.S. technology giants and blue-chip companies. A fresh plunge in oil prices signaled a bleak outlook for energy demand and the global economy.

Futures tied to the S&P 500 edged up 0.4%, suggesting the blue-chip index may hold on to gains made Monday. The Stoxx Europe 600 rose 0.8%, despite a decline in oil-and-gas-stocks.

Oil…

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