"Uncovering Stock Price Clues: MarketWatch.com's New Weekly Podcast"

Despite historical expectations of mean reversion, profit margins for S&P 500 companies have continued to rise over the past 30 years, challenging traditional theories. The possibility of profit margins continuing to rise at the same rate is debated, with some attributing it to the impact of AI on productivity growth. However, skepticism is advised, as past "new era" narratives have led to market bubbles. The stock market's future hinges on profit margin expansion, sales growth, and P/E ratio, with sobering implications if profit margins remain constant or decline.