The long-run average total cost curve: Group of answer choices can be derived by summing horizontally the average total cost curves of all firms in an industry. indicates the lowest unit costs achievable when a firm has had sufficient time to alter plant size. has a shape that is the inverse of the law of diminishing returns. displays declining unit costs so long as output is increasing.

Zara, a global retail and apparel manufacturer based in spain that has successfully implemented this idea by having a continuous flow of new products that are typically limited in supply. zara has created a system that draws its clientèle into its stores, on average, 17 times per year as compared to 4 times per year for most stores. how is zara using it to gain competitive advantage? what specific technologies are used by zara to maintain this advantage over its competition?