Persistent demi-regs and robust tendencies: critical realism and the Singer-Prebisch Thesis

Debate about whether the terms of trade for primary productsrelative to manufactures have a tendency to deteriorate hasbeen ongoing for half a century. The phenomenon itself providesan example of a persistent contrastive demi-regularity. Thisis viewed as the result of a robust tendency, understood asan enduring and pervasive characteristic effect generated bya powerful and stable underlying causal mechanism. On this basis,the key problem for primary products lies in the biologicallimits on consumption, to which may be added capitalism-specifictendencies affecting processes of production and distribution.The paper concludes by arguing that the relevant holistic generictendency under capitalism involves a long-term contraction inthe primary product share of world trade.