A product is slow-selling because of poor quality, or because the price is too high, or because the advertising promotion has not been done well; after analysis, the product is of good quality. So? ['The product is unsaleable because the price is too high.', 'The product is unsaleable because the advertising promotion is not done well.', 'The product is unsaleable either because the price is too high or because the advertising promotion is not done well.', 'The product is slow-selling or neither because the price is too high nor because the advertising promotion is not done well.']