OpenAI, SpaceX and other IPOs could break the S&P 500, Jeremy Grantham says

Core Argument - Jeremy Grantham presents a provocative argument suggesting that the U.S. stock market is expected to yield mediocre returns in the current year [1] Group 1 - Grantham's analysis indicates that the market's performance will be hindered by various economic factors [1] - The argument is based on historical data and current market conditions that suggest a lack of strong growth [1] - Grantham emphasizes the importance of understanding market cycles and the potential for stagnation in returns [1]