While the CHIPS Act successfully incentivizes fab construction, it fails to address the underlying chemical supply chain. Unlike China's holistic 'Big Fund,' this oversight means new US-based fabs will be totally reliant on imported specialty gases, undermining the goal of supply chain security.

Taiwan's entire economy, particularly its critical semiconductor industry, runs on imported Liquefied Natural Gas (LNG) with less than three weeks of reserves. A naval blockade lasting longer than that would shut down the island and its fabs, an act with twice the economic impact of the Great Depression.

Counterintuitively, Thompson argues against cutting China off from Taiwan's semiconductor manufacturing (TSMC). A China dependent on Taiwan is less likely to act aggressively toward it. Creating a situation where the U.S. relies on Taiwan while China does not increases the risk of conflict, as China's optimal move could become disabling that key U.S. asset.

With 97% of high-end chips and 72% of the global foundry market controlled by Taiwan, specifically TSMC, any disruption—from military blockade to cyberattack—would trigger an 'economic apocalypse.' This massive over-concentration creates a singular, fragile chokepoint with no short-term alternative, threatening the entire global economy.

While headlines focus on advanced chips, China’s real leverage comes from its strategic control over less glamorous but essential upstream inputs like rare earths and magnets. It has even banned the export of magnet-making technology, creating critical, hard-to-solve bottlenecks for Western manufacturing.

Beyond financial metrics, the most significant 'tail risk' to the AI boom is the high concentration of advanced semiconductor manufacturing overseas, particularly in Taiwan. A geopolitical conflict could sever the supply of essential hardware, posing a much more fundamental threat to the industry's growth than market volatility or corporate overspending.

Semiconductor fabs are prevented from stockpiling many critical, hazardous gases by strict on-site storage permits. This creates a reliance on a just-in-time, hyper-reliable supply chain, making any disruption an immediate and existential threat to production.

Dan Sundheim identifies a potential conflict with China over Taiwan's semiconductor dominance as the single biggest tail risk to the global economy. Since Taiwan produces over 90% of advanced chips, a disruption to this fragile supply chain would be catastrophic, potentially triggering an economic crisis on the scale of the Great Depression.

While gases constitute only ~10% of a chip's material cost, all 60+ unique chemicals are essential. A fab cannot operate without any single one, regardless of its low cost. The vulnerability lies not in monetary value but in the absolute necessity of every component in the chemical toolkit.