Henry Ford raised his workers' salaries so they could afford to buy his cars. Lesson forgotten?
He raised his worker's wages by 100%. But it wasn't so that they can afford to buy a car. At that salary, you still were looking at a third of your annual income to afford a Model T and more to operate it. There were more pressing needs like food, shelter, health, safety, and kids, that these folks rather spent money on. If you look at old pictures you see that most factory workers walked or biked to work, in the US (and everywhere else, too.)
Ford was ahead of his time in many regards and this was one of the many times it showed. His "problem" was that he (and that is him and many other people) increased production efficiency by 800% in a very short time. That involved a lot of changes which people to this day consider to be stressful (just look what AI is doing today). People lasted on average 4 months before they quit. By increasing the salary not only a bit, but doubling it, he managed to increase this time significantly. It definitely helped that he was the first to employ this tactic. He didn't increase it slowly, which is what his competitors would have done. He made a big increase, which made big news and initially gave him a bad reputation among his peers, but it made a huge impact on people's perception.
What is really interesting is that this was the peak of productivity at Ford. They managed to reduce the time to assemble a car to about 90 minutes. Today an F-150 needs 20 hours. In the end, the time was used to increase the complexity, the feature set, the size, and about everything else, except for the number of cars produced per unit of time which returned to the initial duration before Ford was optimizing the whole process.
It's truly fascinating in many aspects. I still haven't finished reading his biography. I just don't think the lesson you see is in there.