If a firm triples all inputs, and output triples as well, the firm is subject to (A) constant returns to scale. (B) increasing returns to scale. (C) economies of scale. (D) both (b) and (c).

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If a firm triples all inputs, and output triples as well, the firm is subject to
(A) constant returns to scale. (B) increasing returns to scale. (C) economies of scale. (D) both (b) and (c).

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