Text: Shoppers hold mail-order firms to a higher standard than department stores when it comes to keeping things in stock, because the catalogs afford them a photo and item number for every parka, turtleneck, and blazer ever placed in inventory.
Entailment: Shoppers hold mail firms to a higher standard than department stores when it comes to inventory because of the ease of catalog shopping.
Contradiction: Department stores are much better at keeping items in stock than mail-order firms.