And the United States is starting to realize the problems of being too focused on the demand side of the economy. When the federal government offers, for example, rental support in housing-scarce cities, landlords can raise their prices, leaving renters no better off. When it increases financial aid for spiralling college tuition costs, universities are able to eat part of that by raising their tuition. Under banners like “abundance agenda,” “supply side progressivism,” and “progress studies,” various movements are trying to loosen American supply constraints. These are excellent ideas that I hope will be broadly adopted.