Which statement about economies of scale is true?

• A. They exist and affect costs and the decision on optimal firm size.
• B. They do not exist.
• C. They guarantee profits.
• D. They apply equally to all industries.

Answer: (A)

Economies of scale occur when increasing output leads to a lower average cost per unit. This happens because fixed costs can be spread over more units, production processes can become more efficient, purchasing and bargaining power improve, and workers or machinery gain experience (learning effects). Because of these cost advantages, a firm may find a larger scale of operation is cheaper per unit, which influences decisions about how big to make plants, how many units to produce, and whether to expand or contract.

But the effect isn’t unlimited. Beyond a certain point, costs can rise again due to coordination problems, management complexity, or overextension—these are diseconomies of scale. So economies of scale exist and shape cost structures and optimal size, but they don’t guarantee profits, and their presence varies by industry depending on technology, market demand, and competitive conditions.

That’s why the true statement is that economies of scale exist and affect costs and the decision on optimal firm size.