Answer:
Movement in social strata or level.
Step-by-step explanation:
Social mobility occurs when one person or a group people leave their current status to occupy another status by moving within or between the social category in a particular society.
Social mobility can be horizontal or vertical. There is horizontal mobility when the movement occur within the same social strata. An example of horizontal mobility is when a medical doctor is transferred from one hospital to the other to occupy the same position leading to no change is his status.
There is vertical mobility when there is a downward or upward movement in social strata from one strata to the other. For example. promotion of junior accountant to the position of senior accountant within a company is an example of upward vertical mobility, while demotion of senior accountant to the position of junior accountant within a company is a good example of downward vertical mobility,