escalator

indeksiehto

liukuportaat A motor-driven mechanical device consisting of a continuous loop of steps that automatically conveys people from one floor to another.
An upward or progressive course.
{{quote-journal|date=February 19, 2009|author=Froma Harrop|title=Housing aid may revive American dream for Latinos|work=Houston Chronicle
An escalator clause.

They agreed to a cost-of-living escalator.