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Which of the following is true?a. The long-run industry supply curve relates the price of a good or service to the quantity produced after all adjustments to a price change have been madeb. In perfectly competitive industries, the long-run supply curve is always horizontal. c. In establishing the long-run industry supply curve, factor costs and the number of firms are held constant.d. Every point on along-run industry suppl curve shows a price and quantity supplied at which firms in the industry are earning positive economic profit.

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