Fight for $15 supporters should be very worried. Paying $15 an hour to barely skilled labor/high school students on their first job, is just to expensive to businesses. 

Solution is automation. Imagine how many people Wal-Mart could cut from their payrolls by full implementation of this app.

Wal-mart is also working on a special code on every product. Push the shopping cart through a scanning system, every item is scanned. You pay and go. Again no worker involvement. 

Pass this technology on to other companies, again a massive reduction in the number of workers.