a clause in a contract that provides for an increase or a decrease in wages or prices or benefits etc. depending on certain conditions (as a change in the cost of living index)
One can see businessmen and women running down the escalators, most likely late for work, couples holding hands, others seemingly asleep as they wait to get off, listening to the music that blares from the loudspeakers overhead.
VOA: standard.2010.07.10
The ad shows people painted to match a mundane backdrop of brick walls, trees and escalators.