A new strain of COVID-19 sparks a selloff in global markets

From the BBC World Service: As countries including the U.K., Germany and Japan announce restrictions on flights from a number of southern African countries, the WHO now needs to decide if this should be labelled a variant of concern. But, the selloff in markets, coming the day after Thanksgiving, needs a bit more context. And, we hear from global supermarket giant Carrefour on what super-fast delivery adds to its bottom line.