No, you cannot pick out the preference for one component of the offering that way. If there'd been a 5-cents-higher option with the better box, they might have chosen that. You can only compare the entire offerings—convenience, quality of all components combined, cost, customer service, and so on, and say that that entire bucket was what they preferred to the other entire bucket.
Well, with non-diversified commodities, in a market with instant arbitration and universal complete knowledge about the products the Econ 101 models work.