Economists are famously bad at predicting growth. A new technique might help them get a little better. When assessing a country’s potential to prosper, economists typically look at aggregate measures such as education, investment or national debt. This hasn’t worked particularly well: China’s economy, for example, has kept growing at a fast pace even though they’ve been predicting a slowdown …

Annoyed by Congress’s failure to repeal the Affordable Care Act, the Trump administration is redoubling its efforts to undermine the law. The latest act of sabotage: Top federal health officials have been told not to help states sign up Americans for insurance policies as part of this fall’s open enrollment period. Reducing the number of people who buy policies will …

Those cheering the looming departure of Wolfgang Schaeuble from the German Ministry of Finance should not do much. His successor may not be as ornery, but southern Europeans—and above all Greeks—shouldn’t expect any better treatment. Schaeuble has held a wide range of positions since he was first elected to the German parliament in 1972; he’s been interior minister, chief of …