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Joyce P. Jacobsen, James Wishart Pearce III, Joshua L. Rosenbloom, The Effects of Childbearing on Married Women's Labor Supply and Earnings: Using Twin Births as a Natural Experiment, The Journal of Human Resources, Vol. 34, No. 3 (Summer, 1999), pp. 449-474
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Jacobsen et al. (1999) studied this question.
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