The S&P 500 (SNPINDEX: ^GSPC) has soared this year, and that’s terrific news. Investors, watching the index advance last year, were hoping for one thing: the arrival of a new bull market. The index confirmed its presence in bull territory when it reached a record high in January.
Then it went on to reach multiple record highs, and today it’s heading for a 21% gain since the start of the year.
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But one downside of all this momentum is the increase in valuations. Today, the valuations of many S&P 500 stocks have soared, reaching levels that make them — and the market as a whole — look downright expensive. And that might prompt you to wonder whether you should really buy stocks right now. Before making any decisions, though, let’s turn to history for some insight about what the market may do next.
First, let’s talk about why stocks have advanced so much this year. And here, we’ll find two main drivers. After a long series of interest rate hikes over the past two years to tame runaway inflation, investors, anticipating an end to high interest rates, piled into stocks.
They were rewarded when the Federal Reserve recently cut rates by 50 basis points — a more aggressive move than expected; most forecasts were for a decrease of 25 basis points.
Lower rates result in more spending power for consumers since the rates they pay for loans and credit card balances, for example, decrease. And lower rates also ease the financial burden of companies relying on debt to grow. All of this generally helps boost corporate earnings over time.
The artificial intelligence (AI) boom was the second factor to push markets higher, as investors flocked to companies that develop AI products and services as well as companies using AI to improve their businesses. This has helped AI chip designer Nvidia and other technology players like Meta Platforms and Amazon to advance. With the AI market forecast to grow from $200 billion today to $1 trillion by the end of the decade, these companies may greatly benefit.
While these particular players remain reasonably priced considering their outlooks, some companies’ valuations have reached high levels. This is reflected in one particular measure that looks at inflation-adjusted earnings over 10 years in relation to stock price. I’m talking about the S&P 500 Shiller CAPE ratio.
This metric has surpassed the level of 35, and it’s only done this on two other occasions since the launch of the S&P as a 500-company index in the late 1950s. Now let’s consider what the S&P 500 has done in the past following spikes in the CAPE ratio. Over the past 24 years, spikes in the ratio always have been followed by eventual declines in stocks’ valuations — and declines in the index.
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