The Great Fall of China

ONCE the soundtrack to a financial meltdown was the yelling of traders on the floor of a financial exchange. Now it is more likely to be the wordless hum of servers in data centres, as algorithms try to match buyers with sellers. But every big sell-off is gripped by the same rampant, visceral fear. The urge to sell overwhelms the advice to stand firm. Stomachs are churning again after China’s stockmarket endured its biggest one-day fall since 2007; even Chinese state media called August 24th “Black Monday”. From the rand to the ringgit, emerging-market currencies slumped. Commodity prices fell into territory not seen since 1999. The contagion infected Western markets, too. Germany’s DAX index fell to more than 20% below its peak. American stocks whipsawed: General Electric was at one point down by more than 20%.