Answer:
The caste system made it impossible for people to move up in social classes, if your father was a plumber you will follow his line of work without chance to escalate in social class.
Explanation:
The caste system primarily used in India as a part of Hinduism never allowed for a person to move up in social class, if you were born into a lucky family (a Politician/ Banker) you would take your fathers job, and pass it down to your son and so on. It resulted in social inequality for people because it did'nt allow for a person to move up in social class and get a more profitable/enjoyable job. So in summary if you didint like your job (street cleaner) you cant change it and would have to pass the same bad job to future generations.
