Poor People's Movements: Why They Succeed, How They Fail. By Frances Fox Piven and Richard A. Cloward. New York: Pantheon Books, 1977

deal with the issue in the 1960-1970 period with a,;ailable data. At t.he very least, the problem of commuting to other counties and. the unpact of expandll~g0l?portunities for doing so in the 1960s .on nonmetropolitan sustenance orgamzatlon and net migration could have been dIscussed. This review will overlook other technical lim.itations of Frisbie and Poston's work such as their use of cross-sectional measures of sustenance activities to expla' interce.nsal net mi.gration r~tes,. and turn. to a brief discussion of their convention~1 ' analysIs of ecolOgIcal orgamzatlOn followmg the precedent of many other ecological studies. It is informative that sustenance differentiation, retailing, educational service and public administration, as well as certain kinds of agricultural activitie, make substantia! positive contributions to net migration in the 1960-1970 period c