q21 and q22 / thanks

21. Economies of scale occur when as the size of the industry increases. When the factors that create these situations occur outside of the firm itself, these are considered to be of scale. a. cost per unit decreases; external economies b. cost per unit decreases; internal economies c. marginal cost decreases; internal economies d. marginal cost decreases; external economies 22. Internal economies of scale arise from a. Dominance of fixed costs in total costs b. Existence of specialized suppliers, labor market pooling and knowledge spillovers c. Diminishing returns d. All of the above