I mentioned dual-income families. As soon as dual-income families became popular, the banks saw that, oh, they can afford larger loans now. They were allowing people to qualify for more money, and people were in this auction process of bidding up the price of houses.
We don't do that with cars. We don't do that with computers. If your income goes up, you can buy two cars or you can buy two computers. In the housing market, it is, as Mr. Smith described, monopolistic behaviour: selling at what the market can bear.