The damaging impact of economic uncertainty on growth has been reasonably well studied - but what happens when there is uncertainty about economic policy-making? Nicholas Bloom and colleagues have developed a measure of this distinct kind of uncertainty, one that shows the value of restoring...

Until some political mechanism creates incentives to elect moderate representatives who can reach across the ideological divide, the US seems destined to heightened levels of policy uncertainty for many years to come. Some research suggests that such uncertainty, particularly over economic...