Answer:
This is an example of Downward Mobility.
Explanation:
Social Mobility is the power of moving between social classes, the ability to change one's social status. One can move upward (going up on the social class scale) or downward (going down on the social class scale).
This is an example of downward mobility because Mary goes from being high on the social class scale, making $100,000 a year, to losing her job, home and car and becoming homeless. She goes down on the social class scale.
