The following graph shows the marginal revenue (MR) , average revenue (AR) , marginal cost (MC) and average cost (AC) curves for an oligopoly ?rm. Refer to the graph to answer the question. 
Assume that all the ?rms in the oligopoly market face the same set of cost and revenue curves. If they formed a cartel, they would maximize pro?t at the output level _____.
Definitions:
Puberty
The developmental stage in humans when adolescents undergo physical and hormonal changes that lead to sexual maturity and fertility.
Rosacea
A condition characterized by chronic redness and acne over the nose and cheeks.
Unknown
Information or data that is not known, identified, or established.
Full-Thickness
Describes a type of wound or burn that extends through all the layers of the skin, potentially affecting underlying tissues as well.
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