American and European bricks-and-mortar retailing is increasingly becoming dominated by hyper marts, enormous stores that sell groceries,

Question:

American and European bricks-and-mortar retailing is increasingly becoming dominated by "hyper marts," enormous stores that sell groceries, household goods, hardware and other products under one roof. What are the possible economies of scale that might be enjoyed by "hyper marts?" What are the potential diseconomies of scale? How can "hyper marts" fend off competition from web-based retailing?