The Argentine Pampas agricultural production has experienced a remarkable process of technological change during the last 25 years. This undoubtedly contribute to explain the grain production growth verified in the same period. In this paper it is studied a specific aspect of that process, which has as its correlate certain effect on the dynamics of the socioeconomic structure on which the production is based. It is the relative change in the agricultural production functions components: the weight of the intermediate consumption goods increases thus decreasing the expense incurred in the payment of labor. This alteration has a differential impact among different agrarian enterprises, since the investment component on which large farms obtain their principal economies of scale is enlarged while the one which does not constitute an accounting cost for the “farmer” units is reduced. This paper builds and estimates (for the 1992-2010 period) an indicator that measures the evolution of this aspect of the technological change process.