In this paper trade to the interior of the Spanish Empire is analysed. Commodity prices during a 140 years span are described and the price convergence process between Spain and Peru, and between Peru and Chile is investigated. The main finding is that despite technological, trade and institutional improvements, price convergence between Spain and Peru was delayed by wars during the eighteenth century. Conversely, price convergence is found between Peru and Chile. The absence of wars in the Pacific Ocean can explain the difference in price behavior.