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When the retail sector is very concentrated:

A. it is more expensive for a firm to make contact with each individual retailer. B. it makes sense for a firm to deal directly with retailers, cutting out wholesalers. C. a relatively large sales force is required to deal with the retail sector. D. the channels of distribution tend to be long. E. the growth of wholesalers is promoted.

The region that satisfies all of the constraints in a graphical linear programming problem is called the:

A) region of optimality. B) feasible solution space. C) region of non-negativity. D) optimal solution space.