It’s been more than two years since countries started closing their borders to visitors to prevent the spread of Covid-19. Now China, facing its worst outbreak of the pandemic, is trying a new tactic. Henceforth, “unnecessary” overseas travel by Chinese citizens will also be restricted, supposedly to keep residents from bringing the virus home from abroad. The policy, announced earlier ...

Arbitrary round numbers matter, even though they shouldn’t. The definition of a “bear market” as any peak-to-trough drawdown of 20% or more is unhelpful. The difference between losses of 19.95% and 20.05% is minimal. But the definition is often cited, and it has an impact on how people behave. Which brings us to Friday’s trading, when the proximity of the ...

  It’s beyond disappointing that UK Prime Minister Boris Johnson chose to escalate his quarrel with the European Union at this moment, with war raging in Ukraine and unity in the face of Russian aggression of surpassing importance. Unfortunately, it’s not surprising. At issue is the Northern Ireland Protocol, a part of the exit deal Britain struck with the EU ...