S&P 500 Notches Best Week Since 1971 on AI Optimism, Dow and Nasdaq Also Rally
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S&P 500 logged biggest weekly gain since April 1971, up 0.9%
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Investors optimistic about potential impact of AI on economy and markets
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Believe "second leg" of market rally fueled by future AI productivity gains
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In 2023 so far, S&P 500 up 7.7%
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On Friday, Dow rose 0.2%, S&P 500 gained 0.8%, Nasdaq climbed 1.1% to new record highs