Indian stock markets opened higher on Friday, with the Sensex and Nifty indices rising due to gains in auto and metal stocks. This uptick was partially offset by continued declines in FMCG companies like ITC and Godfrey Phillips. Strong December sales data for passenger vehicles suggests economic growth momentum, according to Geojit Investments, though sustainability at a slower pace is to be watched. Consumer durables are also seen as a potential growth area.