A long-running rally, driven by a small group of the largest corporations, has sparked concerns that the U.S.
History indicates that the leaderboard is destined to shift, and the market will naturally adjust. While the largest companies inevitably draw the most attention, their dominance has never been a permanent state. Consider how the market has transformed from the era of industrial titans like Standard Oil of New Jersey (now Exxon) and General Motors to the technology-driven leaders of today. Shifting economic landscapes and the process of creative destruction drive the rise and fall of various companies and industries. In the late 1950s, for instance, the U.S. equity market experienced concentration levels similar to those seen today, with the 10 largest firms representing roughly 32% of total market capitalization. By
Even when adjusted for inflation, returns remain robust at roughly 7%.Stock market concentration ebbs and flows: Leaders change across cycles
Change comes—even for the largest companies
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