This paper shows that there was an improvement in the barter terms of trade for non-fuel commodities vs. manufactures in the late 19 th and early 20 th centuries, followed by significant deterioration over the rest of the 20 th century. However, the decline over most of the 20 th century was neither continuous nor was it distributed evenly among different commodity groups. The far-reaching changes that the world economy underwent around 1920 and again around 1979 led to a stepwise deterioration which, over the long term, was reflected in roughly a halving of real commodity prices. Tropical agriculture fared the worst, whereas minerals had the best performance, with non-tropical agriculture in an intermediate situation. RESUMENEste ensayo muestra que hubo una mejoría en los términos de intercambio de trueque de los productos bá sicos a fines del siglo XIX y comienzos del XX, seguido por un deterioro significativo en el resto del siglo XX. Sin embargo, el deterioro durante la mayor parte del siglo XX no fue continuo ni se distribuyó en forma homogénea en diferentes grupos de productos. Los cambios de largo alcance que experimentó la economía mundial en torno a 1920 y nuevamente a 1979 se reflejaron en una caída escalonada, que a largo plazo redujo los precios reales de productos bá sicos aproximadamente a la mitad. La agricultura tropical experimentó el peor desempeñ o y la minería el mejor, con la agricultura no tropical en una situació n intermedia. El incremento de los precios que se experimentó en la primera década del siglo XXI puede ser el inicio de una nueva fase de alza de larga duració n, pero es demasiado temprano para saberlo.Palabras clave: Productos bá sicos, términos de intercambio, hipó tesis de Prebisch-Singer, cambios estructurales
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