For four years now, the stock market has been on a massive bull run. Since bottoming out in October 2022, the S&P 500 (SNPINDEX: ^GSPC) has soared, fueled in no small part by enormous gains in stocks connected to artificial intelligence (AI). But with stock valuations approaching very extreme levels, investors have good reason to pause and ask: How much longer can this rally last? It turns out history has something to say about that. Image source: Getty Images.
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