Answer: C.Pitirim Sorokin
Pitirim Sorokin was the first sociologist to give a clear distinction between vertical and horizontal mobility. He established the idea of social mobility in his book “Social and Cultural Mobility”. According to Sorokin, society will experience changes from time to time depending on how developed it is. These changes occur as people move from one location to another and interact with other
According to him, horizontal mobility takes place when an individual changes occupation but such change does not affect their social status. Vertical mobility on the other hand occurs when a person changes their occupation which also affects their social status.