Elsewhere in China, a great many people in major cities such as Shanghai and Beijing have remained indoors most of the time in order to reduce their exposure. Governments in countries such as South Korea and Italy may not be taking the extreme measures that China has, but many people are staying home, implying a significant adverse impact on economic activity.

The odds of a global recession have risen dramatically, much more than conventional forecasts by investors and international institutions care to acknowledge. Policymakers need to recognize that, besides interest rate cuts and fiscal stimulus, the huge shock to global supply chains also needs to be addressed. The most immediate relief could come from the US sharply scaling back its trade-war tariffs, thereby calming markets, exhibiting statesmanship with China, and putting money in the pockets of US consumers. A global recession is a time for cooperation, not isolation.

Kenneth Rogoff, a former chief economist of the IMF, is professor of economics and public policy at Harvard University.

​©Project Syndicate

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