Many workers at auto plants in michigan lost their jobs when the plants closed. for the vast majority of these workers, this has resulted in:

It resulted in downward vertical social mobility.

Explanation:

Social mobility means the phenomenon in which an individual (or group) belonging to a particular social position transitions to another according to the social stratification system. There are two types of social mobility: horizontal and vertical.

Vertical social mobility occurs when there is a social class change that can happen upward (from one lower class to another) or downward (from an upper class to another). In the case of the above question, vertical social mobility is occurring as the workers have been laid off. Their social class changed from the working class to an unemployed class, that is, they went from an upper class to a lower class.