The short-run industry supply curve is the sum of the marginal cost curves above average variable cost for all of the firms in the industry,assuming that the number of firms is constant.

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This is because in the short-run, firms are not able to change their fixed costs, so the supply curve only takes into account the variable costs (i.e. the costs above average variable cost). The sum of all these individual firm supply curves will give us the industry's supply curve in the short-run.

The Short-Run Industry Supply Curve Is the Sum of the Marginal