• Korea journal of population studies
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• v.31 no.1
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• pp.75-97
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• 2008

Recently Korea is expected with the decrease of population in working ages and also population structure, especially age structure, has changed as aging goes faster. This study focuses on the relationship between age structure and wage structure to analyzes the cohort size effect on the change of age-earnings profile. Our empirical analysis based on Wright(1991)'s model takes weighted OLS regression using the male worker's data of Ministry of Labor 'Wage Structure Survey'($1990{\sim}2006$). In pooled data, we take the conclusion that the cohort size effect was found in high school and college graduate workers, but the effect is different between them. The labor market entry effect of high school graduate workers is negative(-) and his persistent effect is positive(+). On the other hand, the cohort size effect of college graduate workers have appeared the opposite directions in contrary with the existing results of Welch(1979) and Wright(1991). This results are seen as the possibility that college graduate worker has the benefit of wage level by his relative cohort size in spite of high unemployment of young graduate. It will be the sign of need that we should interest in the change of age structure with balancing the labor supply side approach and the demand side study which the previous studies was mainly tended to focus on.

• Journal of the Korean Home Economics Association
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• v.46 no.1
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• pp.87-101
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• 2008

Using the 1999 National Survey of America's Families(NSAF), this study investigated the factors that affect child care expenses and examined financial and social support of single mother families in the U. S. In this study, 4,676 single mother families with children aged twelve and under are included for the analytical sample. About half of all single mother families with children under age 12 had some amount of child care expenses in 1999. Monthly child care expenses for those who had child care expenses was an average of $255 and it accounted for about 15 percent of their family earnings. The profile of financial and social support showed that about one-quarter of single mothers received financial support for child care, one-fifth received free child care by relatives and about 40 percent received child support payments from nonresident fathers. Tobit analysis results showed that the significant factors that affected child care expenses were mother's age, marital status, educational level, employment status, the numbers of children aged 0-5, family income, the receipt of public assistance and financial support for child care.