Any rational, responsible business leader, faced with an existential threat to his enterprise, would take steps to manage the risk. With his decision to leave the Paris climate accord, President Donald Trump is putting the lie to one of his central claims: that he would run the country like a business. The Earth is threatened with rising seas, violent weather …

European Commission President Jean-Claude Juncker stretched credulity when he told the European Parliament he had known nothing about Luxembourg’s sweet tax deals with large companies; he’d served as finance minister and then prime minister as the small country struck the deals. What Juncker knew aside, one might ask whether there is any other way for small nations to survive among …

When it comes to market volatility, don’t discount the influence of U.S. presidents. According to the Presidential Cycle Theory, the highest stock market returns are achieved in the third year of a new administration. Volatility, though, rises in the first year before peaking later on, as new policies work their way through markets. Since Donald Trump was elected in November, …