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A lo largo del siglo que abarca nuestro trabajo estudiamos primero la documentacion disponible para a continuacion calcular matematicamente las equivalencias que regian el sistema monetario. El cambio entre el maravedi de oro y los dineros de vellon estuvo sometido a constantes tensiones debidas a la creciente tendencia del oro a apreciarse respecto a la plata y a las manipulaciones unilaterales de los dineros por parte del rey. El cambio oficial no reflejaba estos cambios con la suficiente rapidez y los actores economicos empezaron a fijar sus propias condiciones en los negocios privados. Las distorsiones producidas en la economia por el intervencionismo regio fueron combatidas con mas intrusion con la imposicion de tasas de precios y prohibiciones a la exportacion. Al final de nuestro periodo de estudio el maravedi alfonsi deja paso a la dobla como moneda de oro de referencia mientras los dineros de vellon inician un periodo de devaluaciones continuas. Firstly, we will analyze the documentation available, covering a time span of over a century, to calculate mathematically the rates within the monetary system on the basis of these sources. The exchange rate between the gold maravedi and the dinero de vellon was subjected to constant stresses due to the growing tendency of gold to appreciate with respect to silver and the unilateral manipulation of the value of the dinero by the king. The official exchange rate did not reflect these changes fast enough, and economic actors began to set their own conditions in their private transactions. The distortion produced in the economy by royal interventionism was fought with further encroachment through the implementation of price rates and export bans. At the end of our period of study, the maravedi alfonsi gave way to the dobla as the gold coin of reference, while the dinero de vellon began a period of constant devaluation.

Cien años de moneda en Castilla (1172-1268). El siglo del maravedí de oro