background: conduction analgesia is one of the most effective routes for relief of labor pain. combined spinal epidural analgesia may cause less maternal and neonatal complications. these study aimed to investigate the effects of combined spinal epidural analgesia on progress of labor delivery and related complications. methods: in a randomized clinical trial study 220 women in spontaneous labo...

We explore the impact of the child care tax credit in the U.S. income tax system on the labor supply decisions of married women with young children by incorporating the cost of child care into a structural labor supply model. Using data from the 1986 NLSY, we find that government subsidies to child care increase labor supply substantially. Our policy simulations show that an increase in the val...

Life Expectancy, Schooling, and Lifetime Labor Supply: Theory and Evidence Revisited This paper presents a theoretical and empirical analysis of the role of life expectancy for optimal schooling and lifetime labor supply. The results of a simple prototype Ben-Porath model with age-specific survival rates show that an increase in lifetime labor supply is not a necessary, nor a sufficient, condit...

Conventional models of equilibrium unemployment typically imply that proportional taxes on labor earnings are neutral with respect to unemployment as long as the tax does not affect the replacement rate provided by unemployment insurance, i.e., unemployment benefits relative to after-tax earnings. When home production is an option, the conventional results may no longer hold. This paper uses a ...

Enforcement of Labor Regulation and Informality Enforcement of labor regulations in the formal sector may drive workers to informality because they increase the costs of formal labor. But better compliance with mandated benefits makes it attractive to be a formal employee. We show that, in locations with frequent inspections workers pay for mandated benefits by receiving lower wages. Wage rigid...

An increase in the share of youth in the working age population of one state or region relative to the rest of the United States causes a sharp reduction in that state’s relative unemployment rate and a modest increase in its labor force participation rate. This is inconsistent with many theories of the labor market, but can be easily explained by a model of frictional unemployment with on-the-...

The problem of staff scheduling at a truck hub for loading and stripping of the trucks is an important and difficult problem to optimize the labor efficiency and cost. The trucks enter the hub at different hours a day, in different known time schedules and operating hours. In this paper, we propose a goal programming to maximize the labor efficiency via minimizing the allocation cost. The propo...

This paper provides some empirical evidence and a theory of the relationship between residual wage inequality and the increasing dispersion of capital/labor ratios across ...rms. I document the increasing variance of capital/labor ratios across ...rms in the US labor market using Compustat data. I also show that the increase in the variance of capital/labor ratios across ...rms is related to th...

objective : the study evaluated the efficacy and safety of vaginal rogesterone on prevention of recurrent preterm labor. materials and methods: total number of 70 patients with preterm labor treated with intravenous magnesium sulfate in perinatology department of valiasr hospital entered to a randomized clinical trial. treatment group after inhibition of preterm labor with magnesium sulfate rec...