The answer is vending machines on tall buildings...

Globally there must be like: 160,000 tall buildings ranging from: 8 stories to: 45 or 60 stories...

if in each of those floors there was one vending machine and each machine was to make between: $500 and $2,000 a month it will be a: $29 Billion up to a: $90 Billion dollars a year Untapped Global Bussiness....

or if each of those building had a personal kiosk that sold: snacks and sandwiches, maybe meals...

also is a way to advertise big time too, because if each of the stories/floors that each of the: 160,000 tall buildings had 20 people per floor, they will be: 96 Millionnnn people you could advertise to.....