In social science, a social relation or social interaction refers to a relationship between two (i.e. a dyad), three (i.e. a triad) or more individuals (e.g. a social group). Social relations, derived from individual agency, form the basis of the social structure. To this extent social relations are always the basic object of analysis for social scientists. Fundamental enquiries into the nature of social relations are to be found in the work of the classical sociologists, for instance, in Max Weber's theory of social action. Further categories must be established in the abstract in order to form observations and conduct social research, such as Gemeinschaft and Gesellschaft (lit. "Community and Society") or "collective consciousness".
Disputes over the conduct of investigating social interaction relate to the core debates in sociology and the other social sciences: positivism (quantitative research) against antipositivism (qualitative research), structure against agency, structural functionalism against conflict theory, as well as the philosophy of social science itself.
A street market is an outdoor market such as traditionally held in a market square or in a market town, and often held only on particular days of the week. Very similar markets, or bazaars, can also be found in large enclosed spaces, instead of on a street.