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Wall Street's main indexes were higher on Tuesday, the first trading day of the year, buoyed by gains in technology and consumer discretionary stocks.
Major stock indexes closed out 2017 with their best performance since 2013, powered by a combination of strong economic growth, solid corporate earnings, low-interest rates and hopes of corporate tax cuts.
"The first week of trading usually suggests the overall trend of the markets which we expect to be positive," Peter Cardillo, chief market economist at First Standard Financial in New York, wrote in a note.
Gold and copper prices continued their upward march, but the greenback began the year on the back foot, with the dollar index slipping to its weakest level since September.
"While we don't expect the Iranian unrest to reach a full blown political situation just yet, the protest will add to an already positive uptrend in oil and gold prices," Cardillo said.
December payrolls report, data on manufacturing and service sectors are among leading indicators expected during the week, and will be scrutinized for signs of improving economic health and the number of interest rate hikes this year.
Minutes from the Federal Reserve's December meeting, when the central bank raised rates for the fourth time since the 2008 financial crisis, will be issued on Wednesday.
At 9:34 a.m. ET (1434 GMT), the Dow Jones Industrial Average was up 112.06 points, or 0.45 per cent, at 24,831.28 and the S&P 500 was up 9.49 points, or 0.35 per cent, at 2,683.1. The Nasdaq Composite was up 21.51 points, or 0.31 per cent, at 6,924.90.
Advancing issues outnumbered decliners on the NYSE by 1,938 to 652. On the Nasdaq, 1,678 issues rose and 743 fell.