Although the empirical literature is not unanimous about the existence of a continuous long-term deterioration in the terms of trade for commodities (the original and most common formulation of the Prebisch- Singer hypothesis) and, hence, about the possibility of inferring their future behaviour...

This paper looks at the evolution of the terms of trade between commodities and manufactures in the twentieth century. A statistical analysis of the relative price series for 24 commodities and of eight indices reveals a significant deterioration in their barter terms of trade over the course of...