Answer to Question 1
At 12,500 square feet Gap's stores were too large and Gap was incurring diseconomies of scale. When Gap combines its separate Gap concept stores into a smaller space, Gap will use fewer resources, particularly less capital and less labor. Gap's costs will be less as a result. Additionally Gap's sales will be less but the proportionate decrease in cost will exceed the decrease in Gap's production. In this case Gap's average costs will decrease so that Gap can reap economies of scale it currently is not enjoying.
Answer to Question 2
A