After introducing basic concepts of: social relations, individualistic macro-sociology and ethnicity, the author analyzes in great detail Peter M. Blau's theory of intergroup relations and Hubert M. Blalock's idea of ethnic relations. Both of these theories are very important for macro-sociology of social relations and hardly known in this context in Poland. In both cases the author stresses the ethnic aspect of these theories and, in the end, discusses the significance of the 'interactive' approach in sociology of ethnicity, and perhaps in the whole 'macro-sociology of social relations'. The problem of relations between interactions among individual actors on the one hand and large collectivities and relations among them on the on the other is also addressed briefly.
