I asked Kahn if he had a pet theory for why liberals, who tend to be vocal about income inequality, would be more averse to new housing development, which would help lower-income families. He suggested that it could be the result of good intentions gone bad.
"Developers pursue their own self-interest," Kahn said. "If a developer has an acre, and he thinks it should be a shopping mall, he won't think about neighborhood charm, or historic continuity. Liberals might say that the developer acting in his own self-interest ignores certain externalities, and they'll apply restrictions. But these restrictions [e.g. historic preservation, environmental preservation, and height ceilings] add up, across a city, even if they’re well-intentioned. The affordability issue will rear its head."
