Social Security is a pay-as-you-go system: Money in, money out.
For $3 to $4 people are able to write what they like and it'll be sent from a pay-as-you-go SIM, somewhere in the world.
London Mayor Boris Johnson is very proud of his pay-as-you-go rental bicycles installed all over London.
But this pay-as-you-go business is too slow and troublesome.
During this same period, the "pay-as-you-go" system for roadbuilding was adopted.
The "pay-as-you-go" system has reflected favorably on the state's financial reputation.