Walmart

There's been a huge rise in subscription e-commerce companies that aim to redefine shopping. Some claim to eliminate the need to shop for clothing or to visit the drug store. In any case, these services allow you to put customers’ purchases on auto-pilot. Specifically, three models are gaining ground: discovering new products; automating commodities; and demoing products.

Michael Fuller stood in the checkout aisle at a Wal-Mart in North Carolina trying to buy a vacuum cleaner, microwave oven and some other random products which totaled $476. He handed the cashier the fake $1 million bill and awaited his change.