Many retailers at the Point of Sale have a till which is the fast till. On this till, they discourage any slow transactions. For example if you want to ring up items on account, you are encouraged to use another till.
At my pharmacist, I was surprised that now on their fast till they have this sign
As I was going to pay by cash, I had to go to the other till, the slow one. In a way I am not surprised as this is a graph of the average speeds of EFTPOS in our point-of-sale system using tyro by type and day of the week. The lower the bar, the faster it is. The times are listed in thousands of a second, and as you can see with a standard (ethernet) connection in light blue, we are doing an acceptance in just over a second. That is faster then cash plus more secure. No one can take money, calculate the change and give it to the customer in a second.
So the proprietors of this pharmacy have made the fast till EFTPOS only.