The aim of this article is to measure the advance of agricultural productivity in South Navarra between 1780 and 1900. The construction of several indices of agricultural commodities and factor prices allows us to apply the methodology of Total Factor Productivity (TFP). As distinguished from the thesis of stagnation, our estimate of the annual rate of TFP growth in the long run is close to 0.42 %. This rate was particularly high between 1817 and 1850, in a context of deflation and institutional change. During the second half of the century the cyclical evolution of the curve reveals the obstacles derived from the capital resources supply, especially fertilizers and animal traction.

This study aims to answer whether empirical records confirm the existence of a secular decline in the terms of trade affecting primary producers (the Singer–Prebisch hypothesis). The paper analyses the evolution of the terms of trade for agricultural and food products in the second half of the 20th century. We obtain sixty new real price indices for internationally traded agricultural products. We conclude, from a long-term perspective, that the deterioration in the terms of trade for agricultural and food products was strong and clear in the second half of the last century. In general, less processed products suffered a very heavy fall in their real prices. However, there was no continuous and persistent deterioration in the terms of trade either as a whole or for the great majority of the agricultural and food product groups (with the exception of natural rubber, textile fibres and other raw materials). Rather, this deterioration occurred in stages.