번호이동성 시차 도입이 이동통신시장 및 경제적 후생에 미치는 영향 = The Effect of Sequential Introduction of Number Portability on Mobile Telecommunication Market and Economic Welfare

다국어 초록 (Multilingual Abstract)

We studied the effect of 6-month lagged number portability policy on Korean mobile market and economic welfare. Our result shows that in the first year fo the policy, dominant carrier`s market share is decreased while the others are increased. However, after the introduction year of 2004, dominant carrier`s market share is rather increased. This phenomenon shows that the sequential number portability policy does not guarantee the effective compeition to loosen dominant carrier`s monopolistic power in Korean mobile market. The effect of the policy on economic welfare is about 332 billion Won (local currency) in the case of no sequential introduction and that of 6-month lagged introduction case is about 306 billion Won which is less than 7.87%. The 0.3 Won per minute decrease in price can make up the welfare loss of the sequential introduction.

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