Sino-U.S. tech race turbo-charges China chip investment, triggering bubble fear

SHANGHAI (Reuters) - U.S. curbs on Chinese tech firms amid the intensifying Sino-U.S. battle for tech supremacy are feeding an investment boom across China's semiconductor industry, driving prices of both publicly traded and venture-backed companies into bubble territory.Investors have pushed the share prices of the country's 45 listed chipmakers to over 100 times the companies' earnings, making semiconductors the priciest sector in the stock market.There is also a scramble for pre-listing..