After a year and a half of enduring the Covid pandemic together, countries are separating into two groups. One set, comprising large developed economies such as the US and Europe, as well as China and several smaller nations such as Israel, the United Arab Emirates and Singapore, is vaccinating their populations so rapidly that they will achieve a high degree of protection from the virus soon. It will not be long before these nations — accounting for roughly less than a third of the world’s population — will be able to speedily open up their economies to normal activities, including allowing travel to safe countries without the onerous quarantine requirements. The rest of humanity will have to continue suffering new waves of infections and all the restrictions and dislocations that they bring, for at least another year, or longer. 

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