(Figure: Price and Quantity of Output and Table I) For simplicity, assume that there are only three firms in a perfectly competitive industry; their short-run supply curves are depicted in the graph. At a market price of $40, the industry output is ____.

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The Answer of (Figure: Price and Quantity of Output and Table I) For simplicity, assume that there are only three firms in a perfectly competitive industry; their short-run supply curves are depicted in the graph. At a market price of $40, the industry output is ____.

(Figure: Price and Quantity of Output and Table I) for Simplicity