The US stock market is more concentrated than it’s been in decades, with a small number of stocks accounting for an unusually large share of market capitalization. While it’s making some investors uneasy, Ben Snider, a senior strategist on the US portfolio strategy team in Goldman Sachs Research, and Peter Callahan, who covers the US technology, media, and telecommunications markets business in Global Banking & Markets, point out on Goldman Sachs Exchanges that these stocks' valuations reflect strong earnings.

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