Tesla stock gains 20 percent for second day in a row

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The price of Tesla stock soared by 21 percent on Tuesday, rising above $940 for the first time.

Tesla's value has more than doubled since the start of the year-and quadrupled since last September.

What's driving the dramatic rise in Tesla's share price is not clear. Last week, Tesla reported solid but unspectacular profits of $105 million for the fourth quarter of 2019. A number of Wall Street analysts have upgraded their share price targets for Tesla in recent weeks, but Tesla's value is now far above most analysts' estimates.

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