> Tim Redmond of 48 Hills has argued that building more housing would make the problem [high housing costs] worse because the people who would move into it are likely to be wealthy newcomers whose demand for services will increase low-income employment, putting further pressure on older, lower-cost housing.
Right now people are being outbid on homes they would normally win, and in turn are overbidding on lower-priced housing. Increasing the supply even at the high-priced end would help reduce the displacement.
Think of what happened with modern agriculture. Food used to be much more expensive, then we greatly increased yields. People still need food and would be willing to pay more for it, but as the cost of production has fallen, agricultural landowners failed to totally capture the benefits. Instead, society allocated resources that would have gone into low-efficiency agricultural production to other uses, such as industrial goods production.