“East is east,” O. Henry wrote, “and west is San Francisco, according to Californians.” Reflecting last week on the birthday of his bestselling book Abundance, Californian expat Ezra Klein couldn’t avoid some California-hyperfocus of his own, fretting to his co-author Derek Thompson that the trajectory of homebuilding in California didn’t seem to have been budged by the pro-homes YIMBY movement it had birthed around 2014. It was enough, they agreed, to make them doubt.