The answer is the class system of stratification. To simplify, American Idol winner Carrie Underwood signifies the idea of a class system of stratification because as the daughter of a sawmill worker, she experienced intergenerational mobility. In addition, Intergenerational mobility refers to variations in social status among different generations contained by the same family. The class stratification is a custom of social stratification in which a civilization inclines to divide into distinct classes whose members have dissimilar admission to resources and power. An economic and cultural gap typically happens among dissimilar classes.