Economies of scale are also called economies of scale. Scale refers to the batch production, there are two specific situations. One is the change of production batch under the condition of constant production equipment, that is, the change of production batch under the condition of constant production capacity, and the other is the change of production batch under the condition of constant production equipment, that is, the change of production capacity. Scale in the concept of scale economy refers to the latter, that is, the expansion of production batch is accompanied by the expansion of production capacity, while economy has the meaning of saving, benefit and income. According to the authoritative dictionary of economics, economies of scale refer to the existence of economies of scale (or uneconomical) for a product (whether a single product or a composite product) within a certain output range under a given technical condition. In this sense, the long-term average cost curve is the scale curve, and the lowest point on the long-term average cost curve is the minimum optimal scale (hereinafter referred to as MOS). The above definition is universal, and the economies of scale in the banking industry are derived from it.

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