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Stock Market Bubble Fears Grow as AI Stocks Soar to Unprecedented Levels

Strategic Insights

— 3 min read

Economists and experts are sounding the alarm on the possibility of a stock market bubble, fueled by the rapid growth and valuation of artificial intelligence (AI) stocks. The Bank of England, International Monetary Fund, and top financial figures have warned of overheated trade in AI stocks, leading to concerns of a market correction or even a crash. Jamie Dimon, head of JPMorgan Chase, predicts a serious market correction within the next six months to two years.

A bubble is formed when asset prices reach unjustifiably high valuations due to excessive investor optimism. The recent frenzy around weight-loss drug stocks is an example of a bubble that has already burst, with Novo Nordisk's stock down over 50pc in the past year. Simon Adler of Schroders notes that bubbles often occur within specific pockets of the stock market, but a huge bubble across the entire market is a rare event.

The extraordinary performance of technology stocks has led to a significant increase in market concentration. The largest five stocks – Nvidia, Microsoft, Apple, Alphabet, and Amazon – now make up 20pc of the MSCI World, almost double the level seen during the dotcom bubble. This level of concentration can be especially hazardous.

Historical analysis by GMO shows that the top 10 stocks in the S&P 500 have underperformed the other 490 since 1957, but from 2013, they have outperformed the rest of the index by 4.9pc. Mr. Adler points out that this has only happened during the dotcom bubble and the Nifty Fifty in the 1960s-70s.

Concerns are growing that AI stocks are overvalued, with the S&P 500 trading at 23 times forward earnings, compared to 14 times for the FTSE 100. The US stock market also looks expensive, with the Shiller price-to-earnings ratio crossing 40, a level not seen since the dotcom crash.

Some argue that the outperformance of AI stocks is built on solid foundations, with companies investing in AI using free cash flow and not taking on excessive debt. Jason Hollands of Bestinvest notes that these companies are profitable and cash-rich, not speculative start-ups.

However, the potential consequences of a crash are severe. Historical data shows that some of the worst crashes have included the Great Depression, the 1970s oil shock, and the global financial crisis. The US stock market has seen 19 bear markets since 1870, with the most prominent ones shown in the graph.

A stock market crash can have severe losses over several days or weeks, and the duration of a crash varies significantly. The Covid-19 crash and recovery was unusually brief, but larger crashes have seen investors waiting years before recovering their losses.

Key Takeaways:

  • Economists and experts warn of a potential stock market bubble, fueled by AI stocks.
  • The current level of market concentration is unprecedented, with the largest five stocks accounting for 20pc of the MSCI World.
  • Historical analysis shows that the top 10 stocks in the S&P 500 have outperformed the rest of the index by 4.9pc since 2013.
  • The S&P 500 trades at 23 times forward earnings, and the US stock market looks expensive relative to history.
  • Some experts argue that the outperformance of AI stocks is built on solid foundations, with companies investing in AI using free cash flow.
  • A stock market crash can have severe losses over several days or weeks.
  • The duration of a crash varies significantly and can take years to recover from.
  • Investors can take steps to protect their money by diversifying their portfolio, avoiding overvalued stocks, and staying invested.

Statistics:

  • The largest five stocks (Nvidia, Microsoft, Apple, Alphabet, and Amazon) account for 20pc of the MSCI World.
  • The S&P 500 trades at 23 times forward earnings.
  • The US stock market looks expensive, with the Shiller price-to-earnings ratio crossing 40.
  • The Covid-19 crash and recovery was unusually brief, but larger crashes have seen investors waiting years to recover their losses.
  • The US stock market has seen 19 bear markets since 1870.

Sources:

  • The Bank of England, International Monetary Fund
  • Jamie Dimon, head of JPMorgan Chase
  • Simon Adler, Schroders
  • Jason Hollands, Bestinvest
  • Tom Stevenson, Fidelity
  • GMO
  • UBS's Global Investment Returns Yearbook
  • Morningstar
  • Morningstar's Global Investment Returns Yearbook
  • Schroders' research on market concentration
  • CNBC
  • Bloomberg
  • Reuters

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