Missed Nvidia in 2009? This Rare Signal Is Flashing Again.\u00a0In 2009, a “Double Down” signal flashed for a little-known chipmaker called Nvidia.\u00a0For the first time in years, that same “Total Conviction” signal is flashing for a company 1\/100th the size of Nvidia.\u00a0Continue \u00bb<\/a> <\/p>\n Dalio’s warning of a bubble can be supported when viewed through the lens of the cyclically adjusted price-to-earnings (CAPE) ratio. This metric smooths earnings over a 10-year time period and adjusts for inflation. Currently, the CAPE ratio sits near 41. This reading exceeds the 32.6 level reached just before the 1929 crash and is within shouting distance of the all-time high of 44.2 recorded at the height of the 2000 dot-com era. <\/p>\n As shown above, elevated CAPE readings have historically signaled muted future returns. In 1929, the belief that a permanent era of prosperity fueled rapid industrialization eventually collapsed when confidence cracked. This triggered bank failures and ultimately resulted in the Great Depression. Back in 2000, internet companies with little or no sales or profits commanded astronomical valuations based solely on exciting growth narratives. Once capital dried up and reality set in, the Nasdaq (NASDAQINDEX: ^IXIC) lost roughly three-quarters of its value<\/a>. <\/p>\n Today’s CAPE level of 41 places the S&P 500 (SNPINDEX: ^GSPC) in rarefied territory. The parallel is not simply numerical. Just as railroads were set to revolutionize travel and commerce and the internet promised endless digital disruption, AI is now being marketed as an unstoppable force that justifies any valuation. <\/p>\n Dalio points out that paper gains are ballooning far beyond the actual absolute dollars flowing through the financial system. These dynamics inherently create a fragility in which a sudden need for liquidity can force widespread selling. The risk here is not that new technology will fail to deliver productivity gains, but that many AI stocks priced for perfection will correct sharply if growth expectations are not met or when liquidity tightens. <\/p>\n Story Continues <\/p>\n What can investors learn from Ray Dalio? <\/p>\n The grey-shaded columns represent recessions in the chart below. While history shows that elevated valuations eventually compress, the S&P 500 has always trended higher over the long term. <\/p>\n Dalio is not saying that a stock market crash is guaranteed to arrive tomorrow. He is simply reminding investors that upward biases have never been immunized against multi-year drawdowns. The most prudent response is not one of panic selling, but rather disciplined preparation. Maintain diversification across industries, especially durable sectors such as consumer staples, and hold sufficient cash to meet financial responsibilities without forced stock sales. <\/p>\n Investors who treat the AI revolution as one more cycle rather than a generational exception will be better positioned, whether the market continues to climb or eventually revisits the painful corrections of 1929 and 2000. <\/p>\n Should you buy stock in S&P 500 Index right now? <\/p>\n Before you buy stock in\u00a0S&P 500 Index, consider this: <\/p>\n The Motley Fool\u00a0Stock Advisor\u00a0analyst team just identified what they believe are the\u00a010 best stocks<\/a>\u00a0for investors to buy now\u2026 and\u00a0S&P 500 Index\u00a0wasn’t one of them.\u00a0The 10 stocks that made the cut are built for long-term growth and could produce monster returns in the coming years. <\/p>\n Consider when\u00a0Netflix\u00a0made this list on December 17, 2004… if you invested $1,000 at the time of our recommendation,\u00a0you’d have $421,511!*\u00a0Or\u00a0when\u00a0Nvidia\u00a0made this list on April 15, 2005… if you invested $1,000 at the time of our recommendation,\u00a0you’d have $1,381,960!* <\/p>\n That performance is why people listen. With a track record of\u00a0beating the S&P 500 by nearly 5x,\u00a0Stock Advisor\u00a0offers a distinct advantage. Don’t miss the latest top 10 list, available with\u00a0Stock Advisor, and join an investing community built for the long haul. <\/p>\n See the 10 stocks \u00bb<\/a> <\/p>\n *Stock Advisor returns as of August 17, 2026. <\/p>\n Adam Spatacco<\/a> has no position in any of the stocks mentioned. The Motley Fool has no position in any of the stocks mentioned. The Motley Fool has a disclosure policy<\/a>. <\/p>\n<\/a> Ray Dalio. Image source: Getty Images. Analyzing valuation extremes <\/p>\n
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S&P 500 Shiller CAPE Ratio<\/a> data by YCharts<\/a>. <\/p>\n<\/a>
^IXIC<\/a> data by YCharts<\/a>. Why Dalio’s parallel matters <\/p>\n<\/a>
^SPX<\/a> data by YCharts<\/a>. <\/p>\n