BroadChain News, April 27, 16:06, a16z in its latest chart weekly report used extensive data to argue a core point: the tech industry's dominance over the global economy is accelerating. The total market cap of the world's top ten publicly listed companies has surpassed the combined GDP of G7 countries excluding the United States. Artificial intelligence may reshape organizational structures much like railways once catalyzed the modern corporate system. Stablecoins are transitioning from mere transfer tools to actual payment scenarios, while trust among young Americans in traditional media has hit an all-time low.
The combined market cap of the world's top ten publicly listed companies has exceeded the total GDP of all G7 countries except the US. Even excluding Saudi Aramco—a company rarely classified as "tech"—the conclusion still holds. Tech is not just a large industry; it is the largest industry. Since the real takeoff of cloud computing in 2016-2017, within less than a decade, the total market cap of the top ten tech companies has surpassed the global GDP excluding China.
The total market cap of the top ten companies in the S&P 500 is now about six times that of 2015, and their share of the index's total market cap has doubled. By 2025, only three of the top ten companies overlap with those from a decade ago, and only Microsoft can be traced back two decades. If one had modeled tech stocks in 2015 using the largest company in the index at that time, the upside would have been underestimated by about six times. Tech has fundamentally "broken the model," redefining the limits of corporate scale.
Since 2023, the tech sector has contributed over 60% of total market earnings growth. No other industry—not even the energy sector with its brief glory in the early 2000s—has played such a sustained dominant role in earnings growth. Today, it can be said that tech is not just one cycle among many; it is the cycle itself.
Railways at their peak accounted for about 63% of the total US stock market capitalization, described by Bank of America as "the most dominant innovative industry in history." But railways did not die; they catalyzed a new and far larger economic system beyond themselves. While tech is massive today, its dominance relative to the peak of transportation, real estate, or finance in the 19th century is still less pronounced. About 70% of today's market sectors either barely existed or were negligible in 1900.