Watching the autumn sun struggling to break through the fog on Beacon Hill in Boston last Wednesday, I couldn’t help but see it as a metaphor for the global economic outlook experts from Oxford Economics presented that morning. The meeting for policymakers was held, fittingly enough, at the Union Club, a quintessential Boston locale in the shadow of the Massachusetts State House. It was hosted by Gregory Daco, the firm’s Lead U.S. Economist and Kathy Bostjancic, Director of U.S. Macro....