Younger, digitally engaged consumers love to use almost any technology that might make their buying process more self-sufficient, whereas traditional consumers are driven more by cost and ease of use.

More than four in five internet users worldwide said a quick and easy checkout was the most valued aspect of the shopping experience, making it the highest ranked response to a January 2019 survey from iVend Retail.

Cashierless stores, like Amazon Go, have great potential to shake up the brick-and-mortar landscape. According to GPShopper, 48% of US internet users believe scan-and-go technology would make shopping easier. And 43% would rather try scan-and-go than wait in a checkout line.

For some shoppers, a long wait in line at the supermarket may lead them to head out the door. And they don't always make the purchase somewhere else: They may just abandon it altogether.

According to a July 2018 CivicScience survey, nearly 60% of US consumers would rather have their items rung up by a cashier than use a self-service register.