AI’s rapid expansion and the Fed’s next steps stayed in focus, but both stories ran into real-world limits this week. The themes haven’t broken, but the strain is visible.

The AI boom assumed digital growth could outpace physical constraints. Copper’s 22% July surge to $14,625 per ton just proved that wrong.

The cost hit:. A 10-megawatt data center needs 1,200 tons of copper for wiring and cooling. At today’s prices, that’s an extra $17 million per facility, 2-3% of total construction costs. Across the sector’s $600 billion in annual spending, unplanned expenses now reach $12-18 billion.

The timing risk:. Nvidia (45× earnings) and AMD (30×) have priced in double-digit revenue growth, counting on data centers expanding without delay. Even a 5% slowdown in builds could push that growth into 2027, leaving valuations exposed.

The capital question:. Databricks’ $5 billion raise at a $190 billion valuation shows venture money still chases AI aggressively. But rising input costs mean not all bets will pay off as planned.

The Federal Reserve kept rates at 3.50-3.75% in July, but the 9-3 vote, the most opposition since 2021, highlighted growing disagreement. Recent reports only added to the debate:

The Fed’s tight spot:. With core inflation at 3.4%, officials face two bad options:

Markets now put a 67% probability on no September hike, but bond yields suggest traders see more inflation ahead than the Fed’s forecast assumes.

Brent crude climbed 6% to $88.52 this week, not because supply is tight, but because geopolitical tensions are acting like a tax on global trade.

The shipping squeeze:. The Strait of Hormuz, where one-fifth of the world’s oil passes through, remains effectively closed. Insurers have pulled coverage, forcing tankers to take the long route around the Cape of Good Hope. That adds:

The inflation ripple:. At $90 per barrel, energy prices could push global inflation up by 0.6-0.7 percentage points, just as the Fed tries to bring prices down. Higher oil acts like an unplanned rate hike, cutting into consumer spending and business investment, while giving the central bank less room to ease if inflation lingers.

The U.S. Dollar Index (DXY) dipped 0.3% to 99.67, even as geopolitical risks typically support the greenback. This time, the reaction was subdued.

The shift:. Markets are focusing on U.S. economic fundamentals over external threats. Weak retail sales and fading rate-hike expectations weighed on the dollar, while the euro gained 0.4% to 1.1573.

The takeaway:. The dollar isn’t losing its safe-haven role, it’s being overshadowed by domestic growth concerns. If U.S. data weakens further, the currency could keep sliding, even amid global uncertainty.

Bitcoin ($62,917) and Ethereum ($1,878) ended the week flat, but two developments highlighted the sector’s contradictions:

The tension:. Crypto is gaining institutional traction, but the Harmony hack reminds us that technical risks haven’t vanished, they’ve just gotten more complex.

AI has driven the S&P 500’s 2026 gains, built on one key assumption: data-center capacity would expand quickly and cheaply. Copper at $14,625 per ton is now testing that idea.

If projects face even 5-10% delays, chipmakers like Nvidia and AMD could see revenue shifted into 2027. That matters when:

AI thrived in a low-volatility, low-rate environment. If earnings growth stalls, one of the market’s key stabilizers could lose its footing.