TY - BOOK AU - Sachs, I (Ed.) TI - Main trends in economics SN - 0-04-330225-4 U1 - 330.1 21st PY - 1973/// CY - London PB - George Allen and Unwin KW - Economic development-Social aspects; Social sciences N1 - This essays was originally published as chapter 4 in "Main trends of research in the social and human science", part I, Mouton/Unesco 1970 ER -