Key Takeaways

  • Forward commitments for artificial intelligence capital spending sit near 12% of American GDP, outpacing historic infrastructure builds like the transcontinental railroad.
  • Roughly two-thirds of S&P 500 earnings growth now stems from semiconductors alone, rising to 75% when counting direct hardware suppliers.
  • This extreme concentration mimics South Korea's KOSPI index, leaving broad index funds tied to chip demand rather than diversified corporate strength.
  • The entire buildout relies on an unproven loop: tech giants spend fortunes expecting non-tech enterprises to buy tools that yield measurable productivity gains.
  • Assumptions that massive tech budgets are immune to interest rates overlook how higher capital costs squeeze neocloud financing and enterprise software budgets.

Twelve Percent of GDP Has No Historical Precedent

Alexander Altmann tried to find a historical comparison for the current wave of computing infrastructure investment and hit a wall. Forward capital expenditures by major technology firms currently project to around 12% of United States GDP.

Altmann looked back through history for human projects of similar scale: “What have we done as a human society where we've spent that much money certainly in a short period of time? And I had to start getting like really creative... Pyramids, maybe? But they took hundreds of years, if not thousands. Great Wall of China, maybe? I just can't I can't think of a period where where we've spent...”

Even the transcontinental railroads or the Louisiana Purchase did not absorb capital this rapidly. Today, four or five mega-cap balance sheets, funded by cash reserves from search advertising and enterprise software, are pouring capital into data centers and custom silicon. Altmann describes these firms as cash volcanoes funding the biggest capital experiment in modern financial history.

The American Index Now Trades Like Seoul

The consequence of this single-minded spending wave is what Altmann calls the KOSPI-fication of the American stock market. South Korea's benchmark KOSPI index has long been known among global asset managers for functioning as a direct proxy on a single industry: memory chips and hardware exporters like Samsung.

The S&P 500 now shares that exact profile. As Altmann calculated the numbers, "It's actually it's about two-thirds from semiconductors... So, you basically S&P's become KOSPI."

When three-quarters of index earnings growth comes from chips and immediate hardware suppliers, passive investors in the S&P 500 are no longer buying the American economy. They are buying a concentrated bet on data center expansion.

The Downstream Return Problem

This setup creates an obvious vulnerability. Joe Weisenthal highlighted the core tension: “A lot of the earnings power of the tech companies, the hyperscalers, is predicated on the fact that, well, other companies are going to buy the services so that they can boost their own productivity and get their earnings up.”

Right now, hardware suppliers book instant revenue while software buyers struggle to show matching margin gains. If a regional bank or a retail chain spends tens of millions on computing power but cannot trim headcount or expand revenue, software budgets will contract.

At the same time, founders and executives often act as if the cost of capital has vanished. As Weisenthal noted, “the classic 'it's different this time' is, 'Oh, interest rates don't matter anymore,' right? And this is a classic thing, 'Oh, this is not going to be a rate-sensitive industry because the numbers are so unbelievably high.'” When money costs 5% instead of zero, neocloud data centers and hardware debt facilities face refinancing pressures that cash reserves cannot shield indefinitely.

What to Do With This

Audit your software stack tomorrow morning. If your company pays for compute credits, seat licenses, or model APIs, calculate whether those tools generated measurable revenue or reduced labor hours over the past ninety days. If you cannot point to a dollar saved or earned on an invoice, pause the renewal before the next quarterly billing cycle.