South Korean stocks closed higher Friday as investors purchased tech and financial blue chips despite overnight losses on Wall Street. The Korean won fell against the US dollar. The benchmark Korea Composite Stock Price Index rose 27.71 points, or 1.05 percent, to 2,656.33. Trade volume was moderate at 443 million shares worth 9.93 trillion won ($7.21 billion). Winners outpaced losers 460 to 405. Institutions and foreign investors combined bought a net 537 billion won, while retail investors unl