But there is a non-statistical basis for concern: an ominous parallel with the financial environment that prevailed in the weeks leading up to the October 1987 stock-market crash. On that day — Black Monday — the Dow Jones Industrial Average dropped 22.6% in a single session.

President Donald Trump ’s latest tariff moves drew worries from Wall Street as stocks slumped Friday and Treasury yields fell sharply. Trump signed an order the previous night imposing steep tariffs on 66 countries,

Markets are assessing the reshaped US trade landscape after Trump on Thursday laid out steep new tariffs for dozens of countries.