A large number of people move up the social class ladder, a large number move down, and the social class system shows little change in exchange mobility.
Social mobility is the movement of a person's social position from one to another. The shift could be greater, lower, intergenerational, or intragenerational, and it's not always possible to tell whether it's for the better or worse.
Exchange mobility shows that society is divided into classes, and that these classes keep their population levels largely constant. If a certain number of people shift from the middle class to the upper class, an equal number is anticipated to go in the opposite direction.
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