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By Jamie McGeever ORLANDO, Florida, - US stocks and bonds currently appear highly stretched on several key measures, suggesting investors should tread with extreme caution. The big question is whether we may be at, or near, an inflection point. Wall Street's record-breaking highs mask historic levels of concentration and narrow breadth. Treasury yields are now so high that, depending on your perspective, they either represent a generational buying opportunity or are about to send the equity rally screeching into reverse. Meanwhile, the spiking “term premium” could slam both stocks and bonds. But does that indicate mean reversion is just around the corner? It’s tough to say. Historically high AI-related profits and healthy economic growth could maintain Wall Street's bull run for months if not years, and there's no shortage of reasons why yields cannot rise further, and not all of them are negative. Below are five charts that bring this debate into focus: * Stock market concentration Tech and AI stocks now comprise over 40% of the S&P 500's market cap. That's higher than the peak of the dotcom bubble in early 2000. Add in AI-related companies, and tech's footprint tops 50%, also a record. This level of concentration is fine when tech is surging, but concerns are mounting about the AI revolution, including safety issues and doubts over the technology's long-term economic viability. A turn in AI sentiment could spark a serious correction. On the other hand, if the hundreds of billions of dollars in AI investment start to pay off, the rally could get supercharged. * Equal weight under-performance The current ratio of the equal-weighted S&P 500 index to the market cap-weighted index is collapsing, based on Invesco's RSP EW exchange-traded fund and the SPY ETF. In plain English, the main US index in which stocks have equal weighting is under-performing the more widely followed index by the widest margin in 24 years. That’s almost entirely due to the strong performance of tech and AI names, suggesting corporate America overall is not quite as strong as the record-breaking S&P 500 headlines suggest. * Equity risk premium Investors usually demand a higher rate of return when buying “riskier” stocks versus traditionally “safe” bonds. This difference between the earnings yield on stocks and the 10-year Treasury yield is referred to as the “equity risk premium”. It is currently the lowest in 24 years and is actually negative – a very rare occurrence this century. This should be a signal for investors to start rethinking the size of their equity allocation, though, as of now, we certainly aren’t seeing many signs of that. * Real yields The yield on 30-year Treasury Inflation-Protected Securities is nearing 3.40%, the highest since 2002. That represents the near-guaranteed inflation-adjusted – or “real” – annual rate of return investors can now lock in for the next 30 years. Again, one might expect that to pull capital away from equities and help prop up the ailing bond market, especially as rising real yields are usually indicative of stronger economic growth. Spiking yields should also negatively impact corporate borrowers at some point – the question is when that might be. * Term premium Last but not least, the “term premium” – the market’s wild card. This is the estimated level of extra compensation investors demand in return for buying long-dated Treasuries over short-term debt. What’s pushing up the term premium remains an open question – it could be growing doubts around Fed credibility, US debt debasement fears, or something else entirely. But no matter the cause, the main concern with the term premium is always whether it’s rising or not. If it is, it's potentially a signal of more fundamental problems that could have serious economic and market consequences. And right now it's rising sharply. Enjoying this column? Check out Reuters Open Interest , your essential new source for global financial commentary. Follow ROI on LinkedIn, and X. And listen to the Morning Bid daily podcast on Apple, Spotify, or the Reuters app. Subscribe to hear Reuters journalists discuss the biggest news in markets and finance seven days a week. This article was generated from an automated news agency feed without modifications to text. Catch all the Business News , Market News , Breaking News Events and Latest News Updates on Live Mint. Download The Mint News App to get Daily Market Updates. Oops! Looks like you have exceeded the limit to bookmark the image. Remove some to bookmark this image.
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