While William F. Ogburn coined "cultural lag," Horton and Hunt perfected the teaching of it. They explained that (technology, gadgets) changes faster than non-material culture (values, laws, religion).
Perhaps their most celebrated section. They explain caste systems, class systems, and the power of social mobility. They draw heavily on the work of Karl Marx and Max Weber but present it in a non-ideological, comparative manner. horton and hunt sociology pdf