This paper provides a long-term follow-up of students who participated in the Tennessee STAR experiment. The Tennessee STAR experiment randomly assigned l 1,600 elementary school
students and their teachers to a small class, regular-size class or regular-size class with a…

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The labor supply of female household heads is distributed across a wide
variety of hours and weeks choices. This papers explores the differential
nature of the weeks per year and hours per week decisions among female heads.
A model of…

This paper investigates the effect of entrepreneurs’ personal income tax situations on their
use of labor. We analyze the income tax returns of a large number of sole proprietors before and
after the Tax Reform Act of 1986 and determine…

An instrumental variable can be used to identify the labor market return to schooling by
allowing comparisons between groups of individuals whose differences in schooling levels are
uncorrelated with their underlying marginal benefit from schooling and with other aspects of

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Em solos com elevado grau de intemperismo, a imobilização temporária de fósforo pela biomassa microbiana do solo (BMS) pode ser um mecanismo de retardamento das reações de adsorção. O objetivo do presente trabalho foi avaliar a amplitude no fósforo microbiano…

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