How an 18th Century Tax Created ASML's German Monopoly
Germany's enduring optical monopoly proves that infinite capital cannot magically reverse-engineer a century of lost physical manufacturing expertise.
By Nolan Chu
Sparked by The Glass Famine · discussion
I recently fell down a rabbit hole reading Ed Conway's Substack piece, 'The Glass Famine' and the subsequent Hacker News thread about it. The article details a bizarre geopolitical paradox from 1915. Britain was locked in the desperate, bloody trench warfare of World War I, yet government officials were secretly negotiating to trade colonial rubber to Germany. They were literally supplying their mortal enemy's war machine through neutral third parties just to acquire thousands of Zeiss sniper scopes and binoculars. Britain simply could not manufacture optical glass clear enough to see who their soldiers were shooting at across the trenches.
The covert Swiss smuggling routes involved in this trade are fascinating, but I am going to skip over the geopolitical espionage and focus entirely on the dirty math of manufacturing. How exactly does a globe-spanning empire get this desperate?
The answer lies in what I like to call the CapEx Butterfly Effect paired with a tacit knowledge ledger. A century-long compound interest curve of state capital and localized engineering birthed today's most unbreakable tech monopolies. And to understand how Britain completely lost its optical edge, we have to rewind to a single, boring fiscal policy enacted nearly two centuries prior.
In 1745, the British government introduced a Glass Excise Act. This policy applied a heavy tax to the raw, melted materials used for making glass, specifically measuring those materials by weight. And this mundane accounting decision acted as a massive parasitic resistance on British innovation.
Making high-quality optical flint glass requires adding significant amounts of lead oxide and other dense additives to the melt. These heavy additives increase the refractive index and dispersion of the glass, giving it that crisp, pristine clarity required to bend light accurately without chromatic aberration. But because the Crown was taxing by the pound, British glassmakers were suddenly financially penalized for experimenting with dense, high-quality optics. Every time an engineering team wanted to try a heavier, clearer formula, the tax bill skyrocketed.
So they did what any rational, profit-seeking business would do under those constraints. They pivoted to making thin, garbage glass for windows and cheap bottles.
For over a hundred years, this specific tax lobotomized the domestic British supply chain. The sheer physical mechanics of pristine optical glass rely entirely on a tacit knowledge ledger.
Let's stop and define what that actually means. In heavy physical manufacturing, the most crucial information about how a molten material behaves at extreme temperatures is almost never written down in an academic textbook for digital dweebs to study on a whiteboard. It is held entirely in the muscle memory of the shop floor workers and the physical trial-and-error logs of a specific factory. By financially discouraging heavy glass for a century, the British government systematically destroyed the intergenerational human capital required to make it.
Gone.
While Britain was blindly punishing its own glassmakers to balance a budget, Germany was taking the exact opposite approach. In 1884, a chemist named Otto Schott and an instrument maker named Carl Zeiss secured the financial support of the Prussian government to the tune of a 60,000-mark grant. This state-sponsored hardware grind was designed to fund the agonizing, repetitive physical trials required to create perfectly uniform optical glass at scale.
Unlike a modern consumer app built in a garage over a long weekend, Zeiss and Schott were executing dangerous physical labor. They were melting hundreds of distinct chemical combinations - mixing in barium, zinc, and boron - in specialized high-temperature crucibles. They spent years cataloging failure after failure, battling microscopic bubbles, crystallization, and thermal stress fractures that would shatter weeks of work in an instant. The Prussian state capital provided the vital economic runway to absorb that undocumented physical suffering. And over several decades, that centralized hub of extreme optical precision in Jena compounded into an insurmountable industrial moat.
By the time World War I broke out in 1914, the trap had fully snapped shut. Britain had endless access to raw colonial resources like rubber, but Germany held the absolute physical chokepoint - precision optics. A bad tax in 1745 collided with a strategic subsidy in 1884, forcing the British into the ultimate self-own of arming their enemy just to buy binoculars.
Fast forward to the present day, and that localized ledger of German optical expertise has only compounded further. Carl Zeiss AG is now the exclusive supplier of the ultra-precise optical mirrors used in Extreme Ultraviolet (EUV) lithography machines built by ASML.
EUV lithography is the absolute bleeding edge of the semiconductor roadmap. The machine fires high-powered lasers at microscopic plasma droplets of tin to etch nanoscale transistors onto silicon wafers. But that delicate ultraviolet light has to be bounced perfectly through a complete vacuum using mirrors of incomprehensible smoothness. These mirrors are coated with alternating, nanometer-thin layers of molybdenum and silicon. And the parasitic absorption of UV light by literally anything - even stray air molecules - means the hardware has to be flawless.
Just to give you an idea of the tolerances involved, if an ASML EUV mirror were scaled up to the size of Germany, the biggest bump would be less than a millimeter high.
Yes, really.
This staggering monopoly is the direct downstream consequence of 130 continuous years of localized, heavily funded physical iteration. You cannot just cut a massive venture capital check and expect atomic-scale manufacturing precision to magically appear out of thin air. It is a grueling, multi-generational grind. And when a single region holds onto a physical chokepoint for that long, they dictate the terms of the future to the rest of the planet.
Which brings us to the messy reality of modern industrial policy. Today, politicians look at vulnerable semiconductor or green energy supply chains and assume they can easily reverse-engineer a century of localized manufacturing with a quick round of import tariffs or a flashy domestic tax credit. They operate under the delusion that infinite capital can parachute into a greenfield site and immediately replicate a mature, intergenerational industrial base. If we just pass a subsidy, we are so back.
But the physical world is incredibly unforgiving. Money is cheap, but tacit knowledge is priceless. Throwing billions at a physical bottleneck fails spectacularly when the domestic workforce has been culturally and economically divorced from heavy manufacturing for decades. The only way forward is to endure the agonizing physical trial and error all over again - melting the glass and breaking the crucibles one by one. In the end, nobody can software-patch a century of lost physical manufacturing. Governments just have to play the industrial hand they inherit, and right now, Germany holds all the glass.