2012/03/04: There's an argument you see around sometimes about Henry Ford's decision to pay his workers those famed $5 a day wages. It was that he realised that he should pay his workers sufficiently large sums to that they could afford the products they were making. In this manner he could expand the market for his products.
It should be obvious that this story doesn't work: Boeing would most certainly be in trouble if they had to pay their workers sufficient to afford a new jetliner. It's also obviously true that you want every other employer to be paying their workers sufficient that they can afford your products: but that's very much not the same as claiming that Ford should pay his workers so that they can afford Fords.
So, if creating that blue collar middle class that could afford the cars wasn't why Ford brought in his $5 a day wages, what was the reason?
Actually, it was the turnover of his staff.