Oops
We all know how important it is to reduce plastic consumption. Starbucks does, too—to a certain extent—and they’ll offer a 10¢ discount for any drink you order as long as you bring a reusable cup or a tumbler. 10¢ isn’t a lot, but if you order one every day, you could potentially save $3 every month.
That is, unless this guy rings up your order. They might forget to include the 10¢ discount, which can add up over time. And if they don’t input it in the cash register, that’s a 10¢ profit that nobody can account for.