A few years ago, Hendrik Bessembinder, a finance professor at Arizona State, conducted a study of stock market returns over the past century that yielded interesting results. In his study of approximately 26,000 companies, which also accounted for companies that either went out of business or were acquired, Bessembinder found that approximately 60% of stocks underperformed Treasury bills, even after considering dividends. While approximately 40% of stocks demonstrated relative outperformance, much of this outperformance went to offsetting the underperformance of the laggard 60%. Just 2% of companies were responsible for more than 90% of the aggregate wealth creation of the stock market relative to Treasury bills.
Of course, the impact here is skewed heavily to huge long-term winners given the results were measured by market capitalization. Nvidia’s run to a $4 trillion dollar market value would have a significantly larger impact on an updated version of this study than a mid- or small-capitalization company growing tenfold over a multi-year period. With approximately 40% of stocks outperforming Treasury bills, there remain plenty of winners to choose from, though probably not as many as some would assume. Also, the stocks that move the needle on overall stock market wealth creation eventually tend to break through to become a significant right tail outlier.
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