ronald hart is on spotlight today to answer mine and your questions. in doha is a political scientist who developed the social theory of materialism the theories a useful tool in understanding modern culture used to research focuses on cultural change and its consequences he discovered the values of people in boston dust will calm trees remarkably he's author of last few good knowledge and his words have been translated into sixty languages professor han founded and head of the global network of social scientists called the world values celebrate. in your heart is the guest who spoke like today to talk about those changes. hello and welcome to the show thank you very much for being with us nice to be with you right now well first of all you say in your research that in the west the transition from the society with material values to a post material society has happened in the sixty's one exact. leave the sixty's why are you sure it didn't happen earlier later or why do you think the sixty's it began to happen in the sixty's got it began to happen in si