This is 4 million more U.S. consumers than CIRP’s membership estimate in January. Prime members are roughly 57% of Amazon shoppers, according to CIRP.
Amazon does not disclose how many Prime members it has by country; however, in 2018 it said it had more than 100 million globally. CIRP bases its estimates on survey from 500 U.S. consumers who made a purchase on Amazon April-June 2019.
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