BENGALURU -- Hundreds of venture capital firms from around the world are investing in India for the first time, suggesting a breakout moment for the country's startups but also raising questions about whether the boom will be sustainable.

A startup event in Bengaluru, left, and the Bombay Stock Exchange in Mumbai: Sensex, India’s benchmark index for public equities, is up 25% since the beginning of the year thanks to investor excitement over tech stocks. (Source photos by Ken Kobayashi and Reuters)
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