한국 제조업의 IT 자본 투자에 대한 동태적 효율성 검증
A Dynamic Efficiency Test for IT Capital Investment in the Korean Manufacturing Industries
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초록
본 연구에서는 한국 제조업 13개 부문의 IT자본 투자 성과를 분석하기 위하여 동태적 효율성 달성 여부를 검증하고 가변요소에 대한 비용 및 투입량에 미치는 파급 효과를 측정한다. 기존 정태분석과는 달리 IT자본을 준고정된 투입요소로 설정하고 그 변화율을 비용함수의 설명변수로 포함시켜 IT자본 투자의 내적 적응비용을 고려한다. IT 투자의 동태적 효율성 조건을 만족하는 신축적인 가속도 형태의 투자수요방정식의 충족여부는 Hausman (1978) 분류검증법을 통하여 확인한다. 2-20%범위의 할인율을 각각 적용해 본 결과 모든 할인율에서 IT자본 투자의 동태적 효율성 달성이라는 귀무가설은 기각되었다. IT자본 투자에 대한 산업별 가변비용 탄력성, 중간재 수요 탄력성, 노동수요 탄력성을 각각 추정한 결과 평균 -0.05, -0.05, -0.06으로 나타났다.
Abstract
In order to evaluate the performance of IT capital investment in the Korean manufacturing industries, in this paper, we test for its dynamic efficiency and measure its effects on the costs and demands for variable inputs. The restricted cost function, in which the rate of change of the quasi-fixed IT capital is included as a argument, is estimated by taking into account the internal costs of adjustments for IT capital. The use of Hausman (1978) specification test would enable us to test the null hypothesis that the quantity of IT capital satisfies the dynamic optimality condition. The null hypothesis is rejected for discount rates ranging in value from 2 to 20 percent. The average value of the elasticities of variable cost with respect to IT capital investment by industries is estimated to be -0.05. The estimated elasticities of demands for intermediate goods and labor are, on average, -0.05 and -0.06, respectively.
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