The forecast: Following a major shift to online retail in 2020, retail ecommerce sales will continue to grow by double digits through 2023 and make up an increasing share of total retail sales worldwide. By 2023, we project worldwide retail ecommerce sales will total $6.169 trillion and make up a 22.3% share of total retail sales, up from $3.351 trillion and 13.8% in 2019.