When it comes to housing affordability, the logic of “build build build” is straightforward enough: Housing is too expensive. If there were more of it, prices would fall. …Homebuilders are even pushing a plan for a million new affordable houses. …Unfortunately, it’s not that simple. The problem of housing affordability is much bigger than insufficient supply; it’s a mismatch with demand. And that demand is driven by income inequality that has seen soaring income growth at the top and tepid growth (or even stagnation) in the middle. In other words: The way to improve housing affordability is to reduce income inequality. …What’s needed are policies that increase income for households at the bottom and middle. Rather than boosting the housing supply in the hope that they benefit, the answer is to fix the labor market to make sure that they do.