The origin of the gravity model can he traced as far back as G. W. von Liehnitz in the late seventeenth Century and A. Comte, A. Quételet and H. C. Carey in the nineteenth; it was argued that human behaviour could be treated by analogy to and with techniques derived from the physical sciences,...

As in any area of socio-economic reality, ideological interpretations influence our understanding of matters related to health and health policy. Ideologies simplify and fudge issues. Yet ideologies, social movements and social research relate to each other in complex ways, and there are also...