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Nasdaq index crosses 6,000 as stock market extends rally

Nasdaq index crosses 6,000 as stock market extends rally

The technology-heavy Nasdaq composite index closed above 6,000 for the first time Tuesday as part of a broad rally in stocks being driven by a bullish outlook for U.S. corporate growth.

The Nasdaq index crossed the milestone 17 years after it first reached 5,000 during the height of the dot-com era, a market bubble that would burst when the stratospheric valuations of many young Internet companies proved unsupportable.

Leading the Nasdaq now are stocks of giant Silicon Valley tech companies such as Apple Inc., Facebook Inc. and Google parent Alphabet Inc., which are on much firmer ground.

One measure of tech-stock valuations is the Nasdaq’s ratio of stock prices to...

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