Outlines major social and ecological issues involved in the coevolution of social and ecological systems by initially reviewing relevant aspects of the recent literature relating to economic development and their implications for agricultural development. Coevolutionary qualitative-type models are presented. There has been a failure amongst advocates of structural adjustment policies (involving the extension of markets and economic globalisation) to take account of coevolutionary principles and allow for historical differences in the evolution of communities and their varied circumstances. This lack of sensitivity has had unfortunate social and ecological consequences for some communities eg The Russian Federation and subsistence agriculturalists in some less developed countries. The evolution of globalized market systems involving industrial/commercial agriculture (largely dependent on inputs external to the farm) under the 'patronage' of oligopolistic suppliers is seen to increasingly threaten the balance between social and ecological systems and as undermining the sustainability of both. Capitalistic processes of technological change eg advances in biotechnology, play a major role in this evolution