Button, button - who's got the button?

I found the link to the Medallion presentation (the hyperlinked salary of a cabbie) very intriguing. I never knew how medallions worked until now. Thanks, Kevin!

unwieldy:

The average New York City taxi cab driver makes $90,747 in revenue per year. There are roughly 13,267 cabs in the city. In 2007, NYC forced cab drivers to begin taking credit cards, which involved installing a touch screen system for payment.

During payment, the user is…