According to a projection developed by Edge Retail Insight, Amazon could increase grocery sales by an annual compound growth rate of 13 percent through 2026 from the current $14.5 billion to $26.7 billion. Applying a 14.1 percent annual growth rate for Walmart over the next five years, Edge projects growth from $10.1 billion globally to $19.5 billion in 2026.

Amazon has expanded online grocery sales including the Amazon Fresh service in international markets.  Grocery and food sales totaled $2.2 billion in the fourth quarter of 2020 for Amazon enhanced by Amazon Prime Day.  International expansion has been achieved by partnerships with Morrisons in the U.K. and others. 

Playing catch-up, Walmart is investing heavily in E-commerce and technology compared to a previous emphasis on new stores and upgrades of brick-and-mortar locations.  Walmart international online revenue is driven by Flipkart in India and Rakuten in Japan.