Which is an example of social change in the 20th & 21st centuries?

This is a very complex question, but what stands out as a great example of social change is the emerging of the new super-elite. This shows how far the radical changes associated with neo liberal restructuring have been going. New social class is consisted of the few super rich individuals, usually from the technological field. Their wealth is accumulating more rapidly than before. Money is becoming more mobile on the global scale and that means that it is easily accumulated in one place. New century requires new sociological research methods that can look at the phenomenons from different perspectives.

The answer for Apex is "People buy ready-made food at stores instead of cooking at home"