Tech & healthcare tighten grip on world stock markets
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LONDON (Reuters) - The technology and healthcare sectors have tightened their grip on global stock markets since the coronavirus shock knocked world shares from February's record highs.While banks, airlines and oil majors have been dumped by investors and the value of their shares has plummeted, sectors including the likes of pharma giant Roche and the U.S. tech heavyweights now account for 42.8% of world stocks - more than twice that of energy and financial shares.Healthcare and technology..