In The Gated City, Ryan Avent observed that high housing costs in America’s most productive cities had forced large numbers of middle- and low-income households to either accept long, costly commutes, which eat into the ability of families to work and save, or to move to low-cost, low-productivity regions. Over time, this greatly impairs the ability of working- and middle-class Americans to climb the economic ladder. Moreover, when you move large numbers of people from high-productivity, high-wage regions to low-productivity, low-wage regions, you lower the productivity of the entire country. In other words, the rich homeowners who are fighting development in San Francisco and throughout coastal California are actually making America poorer. That’s not cool.