How has social mobility historically influenced the distinctions between the upper class and middle class in society?

Social mobility refers to the ability of individuals or families to move up or down the social ladder. Historically, this has played a big role in shaping the differences between the upper class and middle class. In many societies, the upper class has often been made up of families with wealth and power that have been passed down through generations, while the middle class has included those who worked hard to improve their economic status through education and jobs. For example, a person from a working-class background who becomes a doctor can move into the middle class, showing how social mobility can change someone's social standing. However, barriers like limited access to quality education can make it harder for people to move up, keeping the upper class and middle class distinct.