Several particularmodels have been constructed to develop the new are still nowhere near to having an overarching model, of the kind economists are used to in the theory of general competitive equilibrium. 19 Some models have as their ingredients large inequalities in land ownership in poor countries and the non-convexities that prevail at the level of the individual person in transforming nutrition intake into nutritional status and, thereby, labour productivity (Dasgupta and Ray, 1986, 1987; Dasgupta, 1993, 1997b). Others are based on the fragility of interpersonal relationships in the face of an expanding labour market and an underdeveloped set of credit and insurancemarkets (Dasgupta, 1993, 1998a, 1999; Section.
