费用粘性是因为业务量增加导致的费用增加额要高于业务量等额减少时费用的减少额。本文从交易费用理论、委托代理理论和不完全契约理论的角度分析了费用粘性的成因;并得出费用粘性的三个影响因素,相应地做出了如何加深研究的展望。 The stickiness of the cost is because the increase of the expenses caused by the increase of the business volume is higher than the reduction of the fee of the business when the business volume is reduced by the same amount. This article analyzes the causes of cost stickiness from the perspectives of transaction cost theory, principal-agent theory and incomplete contract theory, and draws three influencing factors of cost stickiness and accordingly makes a prospect of how to deepen the research.