Indian investors react watching share prices on a digital broadcast outside the Bombay Stock Exchange(BSE) in Mumbai on July 29, 2008. Shares tumbled nearly four percent after India's central bank raised its key short-term lending rate by half-a-percentage point. The bank announced the hike in the repo rate at which commercial banks borrow funds from the central bank in an aggressive bid to tame inflation riding at a 13-year high, prompting a major stock market sell-off.