 He argues that personal celebrity is to be added to the list of those features that determine the major forms of inequality and by analogy with Peter L. Berger's 'knowledge class people' suggests defining the stratum of people whose occupation is connected with celebrity and whose major capital is celebrity with the notion ‘people of celebrity’.Among other things it has been suggested by Grinin to view social Anagenesis/aromorphosis as a universal / widely diffused social innovation that raises social systems’ complexity, adaptability, integrity, and interconnectedness.Together with Andrey Korotayev he has also made a significant contribution to the current Great Divergence debate.