올해로 30주년을 맞이하는 국내 이동통신 서비스 산업은 주파수 활용과 서비스 제공 기술면에서 세계적으로 선도적인 위치를 차지하며 눈부신 성장을 이루었다. 그러나 1990년대 경쟁구조의 정책 추진 이후, 지금까지 사업자별로 고착화된 가입자 수와 매출액 규모를 나타내고 있어 요금인하와 서비스 품질 개선 등의 소비자 후생 증진에 걸림돌이 되고 있다. 본 고에서는 이동통신 서비스 시장을 가입자 수, 매출액, ARPU 측면에서 분석하고 시장점유율, HHI 및 분당수익의 변화율을 통해 사업자별 경쟁구조를 진단한다. 지금까지 이동통신 서비스 시장은 사업자별로 주파수 대역과 서비스 제공 기술에 따라 서로 다른 성과를 나타내고, 경쟁시장과 요금인하와의 상관관계 분석결과, 음(-)의 관계가 존재하며, 경쟁구조의 시장일수록 소비자 요금은 인하된다.
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