However, where the exporter in the exporting country does not produce or does not sell a like product, the normal value may be established on the basis of prices of other sellers or producers. In addition, when there are no or insufficient sales of the like product in the ordinary course of trade (for example, sales by a company with a monopoly) or where because of the particular market situation such sales do not permit a proper comparison, the normal value may be calculated on the basis of the cost of production in the country of origin.