Answer:
social
Step-by-step explanation:
Social mobility refers changes in an individual's social economic class within a stratification system. A social stratification system is the way society ranks individuals and families according to the social status. A person's or a family's social status is generally determined by wealth or power (or both).
When a person moves up the social ladder (stratification system) it means that they are improving their status and society generally perceives them as more valuable. E.g. Serguei Brin went from being a Russian immigrant to an extremely wealthy and powerful person after Google was a success. That is a clear example of a person moving up the social ladder.
People can also lower their social class when they lose their jobs and go through severe economic hardships.