Hettige, S.T.2010-07-062010-07-061990Sri Lanka Journal of Social Sciences, 13(1 and 2):p.19-31https://dl.nsf.gov.lk/handle/1/4996UrbanizationAgricultural productionSocial structureUrban rural exchange relationsSocial SciencesUpper and lower circuits in the context of urban-rural exchange relationsArticle