The short-run market supply curve shows the quantity supplied by all the firms in the market at each price when

The short-run market supply curve shows the quantity supplied by all the firms in the market at each price when each firm's plant and the number of firms remain the same.

Explanation:

The short-run market supply curve is derived from each invidividual short-run supply curve at a given price, stating it as the sum of the quantities supplied by all the firms at this price.

If each firm's plant and the number of firms remain the same, you can calculate the market supply curve.

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