As far as economics is concerned, there are also two ways: the failure of the market and the costofexchange.
经济学论证国家存在的必要性有两个进路:市场失灵说和交易成本说。
2
Then it uses the request - proxy theory, the property right and costofexchange theory, rent-seeking theory to explain the superiority property right.
运用委托——代理理论,产权和交易费用理论,寻租理论论述民营银行的产权优势的成因。
3
The scale which is scientific and reasonable ensures that profit is improved, costofexchange is reduced and enterprise competitive competence is increased, economy of scale is come true as well.