In attempting an answer, I am assuming that the question refers to retail stores that are principally FOOD sellers, that may also offer other non-food goods (flowers, gifts, cards, pharmaceuticals / medical supplies, recorded music, etc.). These are principally offered to take advantage of the traffic (customer presence) drawn by the need to replenish household supplies of food - and share the same problems as other retailers of those goods: product selection, price, promotion, and place of display.
In attempting an answer, I am assuming that the question refers to retail stores that are principally FOOD sellers, that may also offer other non-food goods (flowers, gifts, cards, pharmaceuticals / medical supplies, recorded music, etc.). These are principally offered to take advantage of the traffic (customer presence) drawn by the need to replenish household supplies of food - and share the same problems as other retailers of those goods: product selection, price, promotion, and place of display.
For FOOD goods, the problems are:
Replenishment logistics
Spoilage
Price
Pilferage
Customer service
Purchase instrument management
Labor scheduling