American political commentators have frequently called for the U.S. president to take effective action to improve world economic growth. Such calls are a form of what Matthew Yglesias has dubbed “Green Lanternism”—the unspoken theory that the U.S. president’s ability to affect outcomes is primarily affected by his willpower. In this article, I examine the opposite—and ...

Next month, the Irish and British people should be celebrating the 20th anniversary of the Good Friday Agreement. The agreement serves as the cornerstone of the power-sharing deal between Northern Ireland’s unionists and nationalists that helped bring an end to years of violence. It has cemented a long-term constitutional settlement between the United Kingdom and ...