The Main Sources of Economies of Scale Are

The main sources of economies of scale are

A) increasing marginal cost and decreasing marginal product.
B) specialization of resources such as labor and capital.
C) caused by the difficulty of coordinating and controlling large enterprises.
D) decreasing marginal cost and increasing marginal product.
E) an increase in a firm's bargaining power to lower the wage rate and the cost of capital as the firm's output increases.