공항 그룹 의 운영 효율 성 에 관한 연구 - 규모 의 경제 효과 와 규모 의 비 경제 효과 - < 한국 항공 경영 학회 < KISS 
 홈 한국 항공 경영 학회 > 한국 항공 경영 학회지 > 공항 그룹 의 운영 효율 성 에 관한 연구 - 규모 의 경제 효과 와 규모 의 비 경제 효과 - 
 공항 그룹 의 운영 효율 성 에 관한 연구 - 규모 의 경제 효과 와 규모 의 비 경제 효과 - 
 Evaluating Operational Efficiency of Airport Group - Number of Airports as a Factor Affecting Economies and Diseconomies of Scale - 
 박재희 ( Jae - hee Park ) , 김지희 ( Ji - hee Kim ) 
 Ⅳ . 연구 대상 과 변수 
 Majority of previous studies have so far focused either on estimating efficiencies of airports on an individual level or the comparison between standalone airports and group airports . But it should be noted that airport groups can have different level of efficiency of their airports depending on the number and size of them . This paper aims to see how airport efficiency is affected with the variance in airport number of airport groups . A two - stage approach is applied in this paper : In the first stage , performances are measured and , in the second stage , relationship is estimated between the number of group airports and efficiency . First , Data Envelopment Analysis ( DEA ) is employed to measure airport efficiency based on a panel data of input and output measure of the 124 Asia / Pacific and European airports over the period from 2015 through 2017 . And then , Tobit Regression is performed with 45 airports managed by airport groups to estimate the relationship between airport number and efficiency . Our analysis finds an inverted U - shape relationship between the number of airports and their efficiency . It means that , as the number of airports within an airport group rises , so does the scale economies , contributing to enhancing efficiency until certain point , from which diseconomies of scale set in to adversely affect the efficiency of airports . The scale economy arises with the bargaining power enlarged by the airport growth in number , reduction in managerial cost driven by bulk purchase and massive personnel recruitment / training , and frequent knowledge transfer which becomes frequent and easy within an airport group . Meanwhile , diseconomies of scale come about when the benefit of scale economies is offset with the growing managerial cost arising from duplication of management and complexity of procedures . This study , under the circumstances where conflicting interests are observed from local authorities and communities with the emergence of global airport groups actively acquiring ownership and / or concession of airports globally , has practical implication in determining the ideal number of airports to be operated in terms of maximization of airport efficiency .