Retailers like Walmart, Amazon, and Target are competing to see who can get orders fulfilled the quickest. Retailers like Walmart, Amazon, and Target are competing to see who can get orders fulfilled the quickest. SDI Productions/Getty ImagesRetailers like Walmart, Amazon, and Target are competing to see who can get orders fulfilled the quickest. SDI Productions/Getty ImagesThis story is available exclusively to Business Insider subscribers. But these single-digit milestones are probably not going to become the norm anytime soon, supply chain consultant Ralph Asher told Business Insider.