Why are producers interested in achieving an economy of scale

Producers or companies seek an economy of scale because by doing so it tends to dominate the market for certain products. When this happens, a natural monopoly is created and profits are enhanced.

the correct answer is b

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necessary and proper clause. the congress shall have power to all laws which shall be necessary and proper for carrying into execution the foregoing powers, and all other powers vested by this constitution in the government of the united states, or in any department or officer thereof.