The folk-pop singer Jewel is famous for having lived in her van when she first moved to San Diego and started performing in a coffee shop. Soon after she was signed by Atlantic Records, her advance allowed her to rent a house and buy a new car. What class-based phenomenon is this an example of?'

Social mobility

Explanation:

Social mobility -

It is the process of movement, where some category of people, household, individuals move in a society.

It is the alteration in the social status with respect of current status of the society.

It refers to the movement between the layers in the social stratification.

hence, from the question information,

The example shown in the question is of social mobility.