In his new book, “Globalization and Its Discontents Revisited: Anti-Globalization in the Era of Trump,” Stiglitz argues that economists missed something important about these towns: They have social capital. Trust is what you might call the “magic fairy dust” that helps economies thrive. When people trust each other, they work better and harder and they tend to live happier lives, as Harvard professor Robert Putnam's research has shown. Overall, trust has eroded substantially in the United States in recent years as fewer and fewer people have a bond with their neighbors, let alone the government, businesses or civic institutions. But trust still exists in many of these smaller towns where people talk to and watch out for each other. That can be harnessed to transform the town for the 21st century, Stiglitz says...