This article, which is clearly drafted, does not leave room in its interpretation for the application of the theory of unforeseeable circumstances with regard to good faith that obviously constitutes a general principle of law. This is because the article requires that the party obligated by a contract must conduct himself like a person conscious of his responsibility to fulfil all of his obligations, whatever the magnitude of those obligations, even when supervening circumstances occur that were unforeseen or unforeseeable ... This is especially true if we take into account that in accordance with Article 385 of the Commercial Code, a sale of commercial character is not rescinded even on account of lesion ... However if unforeseen circumstances exist that fundamentally alter the economic circumstances of a certain social group, the contractual terms can be changed by way of general dispositions. [15]