T. What economic principle underpins the Roy:F model of heterogeneous workers? Select one: A. Law of one price B. Comparative advantage C. Equation of marginal benets and costs D. IClompetitive convergence in the long run E. Utility maximization 3. The opportunity cost of obtaining human capital is: Select one: A. The income foregone while acquiring it. B. The direct cost of books. supplies, and tuition fees. 0. The job experience lost while attending school. B. The estimate of the increase in salary that results from the acquisition of skills