The demise of previously leading retailers in their respective sectors, Comet, Jessops, HMV and Blockbuster, is largely blamed on their failure to adapt to online retailing. Commentators suggest that by not changing their business model to モclicks & bricksヤ (from モbricks & mortarヤ), as others like Tesco and Argos have done, these previously market leading, but now collapsed, companies missed a trick.