전문대 졸업자와 4년제 대학졸업자 간 졸업 후 첫 직장에서의 임금격차의 변화에 대한 연구

초록

I study the trend of and explanations for intra- and inter-cohort wage differences between vocational college graduates and four-year university graduates who have finished their tertiary education from 2008 to 2015. I use the data on wages in their first job after graduation from the Graduates Occupational Mobility Survey. I use Oaxaca-Blinder decomposition method to examine the average wage differences and the re-centered influence function decomposition method to examine the wage differences at various quantiles over wage distribution. The decomposition formulae I use allow both intra- and inter-cohort comparisons. I find the following. First, the intra-cohort educational wage differences between the averages and between most quantiles have diminished over the years. Second, the wage differences explained by differences in the average observable characteristics of the workers have not varied much. The diminishing wage differences between the averages and between low to middle quantiles are mainly due to rising price for given characteristics of vocational college graduates. Third, educational wage differences have diminished at lower quantiles before they have at higher quantiles. I also get the similar decomposition results of average wage differences using the Labor Force Survey data.

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