Chapter one: Compute is a production input

In 1865 a young English economist named William Stanley Jevons published a book with an alarming thesis. Britain's industrial dominance rested on coal, and coal was being consumed at a rate that efficiency could not save. The intuition of the day ran the other way. James Watt's steam engine burned a fraction of the coal that Newcomen's had, so surely better engines meant less coal. Jevons showed the opposite. Every improvement in the efficiency of the engine lowered the cost of steam power, every fall in the cost of steam power opened uses that had been uneconomic the day before, and total coal consumption rose. "It is a confusion of ideas," he wrote, "to suppose that the economical use of fuel is equivalent to a diminished consumption. The very contrary is the truth."

A hundred and sixty years later the same confusion of ideas is sitting in AI budget lines, and it is worth naming before this book goes anywhere else, because the Compute layer is where most organisations first discover that their intuitions about AI economics are wrong.

The price of a unit of machine intelligence has been falling for years, steeply and publicly. The bills have not. Azeem Azhar, who tracks these dynamics as closely as anyone, puts the elasticity in numbers: a 10 per cent cut in token prices produces a 12 to 18 per cent rise in consumption. Cheaper intelligence does not shrink the invoice, it multiplies the uses, exactly as cheaper steam power did. When China's Kimi K3 model was released with its weights free to download, the reflex reading was that the cost of AI had just collapsed. The weights cost nothing, the rack its 2.8 trillion parameters need to run costs four million dollars. Jevons would have recognised the shape of the misunderstanding immediately.

So the first thing to understand about compute is what kind of thing it is. It is not a product you buy once, and it is not a capability you install. It is a production input, like energy, like steel, like labour, consumed continuously, priced by the unit, and subject to the oldest dynamics in industrial economics.