Toyota’s innovations, by contrast, have [focused] on process rather than on product, on the factory floor rather than on the showroom. That has made those innovations hard to see. But it hasn’t made them any less powerful.

At the core of the company’s success is the Toyota Production System, which took shape in the years after the Second World War, when Japan was literally rebuilding itself, and capital and equipment were hard to come by. A Toyota engineer named Taiichi Ohno turned necessity into virtue, coming up with a system to get as much as possible out of every part, every machine, and every worker. The principles were simple, even obvious - do away with waste, have parts arrive precisely when workers need them, fix problems as soon as they arise. And they weren’t even entirely new - Ohno himself cited Henry Ford and American supermarkets as inspirations. But what Toyota has done, better than any other manufacturing company, is turn principle into practice. In some cases, it has done so with inventions, like the andon cord, which any worker can pull to stop the assembly line if he notices a problem, or kanban, a card system that allows workers to signal when new parts are needed.