The Main Sources of Economies of Scale Are

The main sources of economies of scale are

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