A short run market supply curve for a good manufactured within a purely competitive industry is derived through: (w) vertically summing the marginal cost curves above the AVC curves for all firms which may potentially enter the industry. (x) adding together the resource supply curves for all resources utilized in the industry. (y) diagonally summing average total cost curves for all firms within the industry. (z) horizontally summing the marginal cost curves above the average variable cost curves for all existing firms into the industry.
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