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Article

Analysis of Marginal Effects on Regional Production in Metropolitan Areas Using an Extended Cobb-Douglas Production Function: Transport Infrastructure Supply and Travel Accessibility

확장형 콥-더글라스 생산함수 기반의 대도시권 지역 생산 한계효과 분석 : 교통인프라 공급과 통행 접근성을 중심으로

Ingyu CHOI1
,
Taejun KIM2
,
Wooseok KANG3
,
Minjun HONG4
,
Junghwa KIM5*
최 인규1
,
김 태준2
,
강 우석3
,
홍 민준4
,
김 정화5*
1Master Course, Department of Urban & Transportation Engineering, Kyonggi University, Gyeonggi 16227, Korea
2Ph.D Course, Department of Urban & Transportation Engineering, Kyonggi University, Gyeonggi 16227, Korea
3Officer, Balanced Development Policy Division, Balanced Development Headquarters, Seoul Metropolitan Government, Seoul 04524, Korea
4Associate Research Fellow, Department of Public Administration and Innovation, Korea Institute of Public Administration, Seoul 03367, Korea
5Associate Professor, Department of Urban & Transportation Engineering, Kyonggi University, Gyeonggi 16227, Korea
1경기대학교 도시･교통공학과 석사과정
2경기대학교 도시･교통공학과 박사과정
3서울특별시 균형발전본부 균형발전정책과 주무관
4한국행정연구원 행정혁신연구실 부연구위원
5경기대학교 도시･교통공학과 부교수
*Corresponding Author
31 October 2026. pp. 895-912
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Abstract

This study estimates the nonlinear marginal effects of transport infrastructure and metropolitan transport hub accessibility on local economic performance in Seoul and classifies administrative dongs to support region-specific transport investment strategies. Using data for 427 administrative dongs, an extended Cobb-Douglas production function was estimated with GRDP, labor, capital, transport infrastructure, and accessibility variables. The derived marginal effects for six infrastructure and accessibility indicators were used in a two-stage clustering analysis combining Ward’s method and K-means. The results classified Seoul’s administrative dongs into four types: peripheral infrastructure expansion areas, transit and accessibility saturated areas, urban rail and parking-oriented areas, and accessibility-sensitive areas. Peripheral infrastructure expansion areas showed high responsiveness to road and bus infrastructure, while transit and accessibility saturated areas showed limited marginal effects from additional supply, suggesting the importance of operational efficiency. Urban rail and parking-oriented areas showed that increasing the number of lines serving existing urban rail stations and securing or expanding parking areas can be linked to local economic activity. Accessibility-sensitive areas showed greater effects from reducing access time to rail transfer stations and improving bus connections than from increasing urban rail stations or lines. These findings show that transport investment effects vary by local conditions and provide evidence for tailored metropolitan transport strategies considering physical supply, functional accessibility, and nonlinear marginal effects.

Keywords
accessibility
extended Cobb-Douglas production function
marginal effect
region-specific transport policy
transport infrastructure

본 연구는 서울시 행정동 단위에서 교통 인프라와 광역교통 거점 접근성이 지역경제 성과에 미치는 비선형 한계효과를 산출하고, 이를 바탕으로 지역을 유형화하였다. 서울시 427개 행정동을 대상으로 지역내총생산, 노동, 자본, 교통 인프라, 접근성 변수를 포함한 확장형 콥-더글라스 생산함수를 추정하고, 산출된 6개 한계효과를 활용해 Ward법과 K-means 기반 2단계 군집분석을 수행하였다. 분석 결과, 서울시 행정동은 외곽 인프라 확충 중심형, 대중교통･접근성 포화형, 도심 철도･주차 중심 지역, 접근성 민감 지역으로 구분되었다. 외곽 인프라 확충 중심형은 도로･버스 인프라 반응성이 높고, 대중교통･접근성 포화형은 추가 공급보다 운영 효율화가 중요한 유형으로 나타났다. 도심 철도･주차 중심 지역은 기존 도시철도역의 경유 노선 수 확대와 주차장 면적 확보･확대가 지역경제 활동과 연계될 수 있으며, 접근성 민감 지역은 도시철도역 수나 경유 노선 수 확대보다 철도(환승)역 접근시간 단축과 버스 연계 개선 효과가 큰 것으로 분석되었다. 이는 대도시권 내부에서도 교통 인프라 및 접근성 개선 효과가 지역 여건에 따라 다르게 나타남을 보여주며, 물리적 공급과 기능적 접근성을 함께 고려한 지역 맞춤형 투자 전략 수립의 기초자료로 활용될 수 있다.

키워드
접근성
확장형 콥-더글라스 생산함수
한계효과
지역 맞춤형 교통 정책
교통 인프라
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Information
  • Publisher :Korean Society of Transportation
  • Publisher(Ko) :대한교통학회
  • Journal Title :Journal of Korean Society of Transportation
  • Journal Title(Ko) :대한교통학회지
  • Volume : 44
  • No :5
  • Pages :895-912
  • Received Date : 2026-05-29
  • Revised Date : 2026-06-24
  • Accepted Date : 2026-07-21
  • DOI :https://doi.org/10.7470/jkst.2026.44.5.895
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