The old central-bank playbook of slashing interest rates to spur consumption, investment, and employment has become less effective since the 2008 financial crisis. Yet without effective tools and the public's confidence, central banks will be unable to rise to the occasion when the next recession arrives.

French President Emmanuel Macron has drawn criticism for describing NATO as brain dead and pursuing a rapprochement with Russian President Vladimir Putin. But now that a wayward America could abandon the continent at any moment, Macron's argument for European defense autonomy is difficult to refute.

The Arab world has witnessed at least one big Brexit-like event every decade since 1948 – and these political, economic, and social ruptures never seem to heal. The impact of these self-inflicted disasters is now painfully evident, and ongoing street protests in several countries suggest that a moment of reckoning may have arrived.