The statement above is TRUE.
Social mobility refers to the movement of individuals or families within or between social strata in a particular society. It means a change in social status relative to one's present location with a given society. Social mobility in US does not depend on where one start in the class system; one can come from the lowest class strata and become one of the richest individual and an individual from a very rich family can also end up as a p.auper. A lot of factors come to play in these situations.