which of the following is true about economies of scale and increasing returns to scale? responses economies of scale and increasing returns to scale are the same thing. economies of scale and increasing returns to scale are the same thing. economies of scale refers to the relationship between inputs and output. increasing returns to scale refers to the relationship between long-run average total cost and the size of the firm. economies of scale refers to the relationship between inputs and output. increasing returns to scale refers to the relationship between long-run average total cost and the size of the firm. economies of scale refers to the relationship between long-run average total cost and the size of the firm. increasing returns to scale refers to the relationship between inputs and output. economies of scale refers to the relationship between long-run average total cost and the size of the firm. increasing returns to scale refers to the relationship between inputs and output. economies of scale is a long-run concept, while increasing returns to scale is a short-run concept. economies of scale is a long-run concept, while increasing returns to scale is a short-run concept. increasing returns to scale is a long-run concept, while economies of scale is a short-run concept.