Changing Family Behavior and the U.S. Income Distribution

The trend toward increasing family income inequality in the U.S. over the past several decades is well documented. Among possible explanations for this increase are rising inequality in individual earnings, changes in family labor supply decisions, and changes in family structure and living arrangements. We analyze the contribution of the latter two factors to rising family income inequality during the 1980s using conditionally weighted density estimation, a semiparametric decomposition technique recently pioneered and applied to assess the causes of rising earnings inequality (DiNardo, Fortin, and Lemieux 1996). This technique enables estimation of the impact of the modeled factors on the complete distribution of income. We use data from the March Current Population Surveys for the years 1980 and 1990, which yield family income information for the years 1979 and 1989. The primary effect of both changing family structure and changes in wives' labor force participation was on the midpoint of the family income distribution. The effect of changing family structure on rising inequality was small over this period, primarily because the net change in family structure was small. However, the increase in wives' labor force participation explains about 10 to 25 percent of the increase in family income inequality.

Inequality and poverty in the United States: the effects of changing family behavior and rising wage dispersion

The trend toward increasing inequality in family income in the United States since the late 1960s is well documented. Among key possible explanations for this increase are rising dispersion in individual earnings, changes in female labor supply decisions, and changes in family composition and living arrangements. We analyze the contribution of these factors to changes in family income inequality and poverty during the years 1969-1998, focusing on labor supply and family structure as behavioral changes but accounting also for changes in the distribution of male earnings. Our analyses rely on conditionally weighted density estimation, a semiparametric decomposition technique recently developed by DiNardo, Fortin, and Lemieux (1996). We also use a relatively novel rank-based distributional exchange to assess the effects of changes in the distribution of male earnings. ; In our empirical work, we first analyze changes between 1969 and 1989, which corresponds roughly to the period of rising inequality that has been the focus of previous work. Our results indicate that rising dispersion of male earnings and the decline of traditional forms of family structure respectively explain up to about three-fourths and about one-half of rising inequality in family income during this period. The impact of changing family structure was most pronounced in the lower half of the distribution. In contrast, the increase in female labor force participation offset rising inequality to some degree, mainly in the upper half of the distribution, although its impact has moved down the distribution over time. In extending the analyses to the 1990s, we find that the rate at which inequality grew slowed after 1989, but the explanatory factors continued to have substantial effects. In each decade, the effects of the explanatory factors on poverty were especially large and followed a pattern similar to that for inequality.Poverty ; Income distribution ; Income

Cross-National Trends in Earnings Instability and Earnings Inequality

Changes in inequality of yearly earnings can arise from changes in the distribution of lifetime earnings (permanent changes) and changes in the stability of earnings (transitory changes). Past research has found increases in both components in the United States over the past several decades. We extend this literature by comparing the United States with Germany and Great Britain. We use data from the Cross-National Equivalent Files (Cornell University) to document trends in cross-sectional and long-run earnings inequality. These data enable us to examine earnings dynamics during the years 1979-1996 for the United States, 1983-1997 for Germany, and 1990-1997 for Great Britain. Despite differences in labor market structure, our descriptive models reveal similar basic patterns of earnings mobility and dynamics in these countries. We then apply a method of moments approach to estimate the parameters of a heterogeneous growth model of permanent and transitory earnings. The results indicate that although there are substantial differences in overall cross-sectional inequality across these countries, the persistent component of earnings inequality was quite similar in each in the 1990searnings mobility, inequality, comparative

The Effect of an Employer Health Insurance Mandate on Health Insurance Coverage and the Demand for Labor: Evidence from Hawaii

Over the past few decades, policy makers have considered employer mandates as a strategy for stemming the tide of declining health insurance coverage. In this paper we examine the long term effects of the only employer health insurance mandate that has ever been enforced in the United States, Hawaii's Prepaid Health Care Act, using a standard supply-demand framework and Current Population Survey data covering the years 1979 to 2005. During this period, the coverage gap between Hawaii and other states increased, as did real health insurance costs, implying a rising burden of the mandate on Hawaii's employers. We use a variant of the traditional permutation (placebo) test across all states to examine the magnitude and statistical properties of these growing coverage differences and their impacts on labor market outcomes, conditional on an extensive set of covariates. As expected, the coverage gap is larger for workers who tend to have low rates of coverage in the voluntary market (primarily those with lower skills). We also find that relative wages fell in Hawaii over time, but the estimates are statistically insignificant. By contrast, a parallel analysis of workers employed fewer than 20 hours per week indicates that the law significantly increased employers' reliance on such workers in order to reduce the burden of the mandate. We find no evidence suggesting that the law reduced employment probabilities.health insurance, employment, hours, wages

Union effects on health insurance provision and coverage in the United States

Since Freeman and Medoff's (1984) comprehensive review of what unions do, union density in the U.S. has fallen substantially. During the same period, employer provision of health insurance has undergone substantial changes in extent and form. Using individual data from various supplements to the Current Population Survey and establishment data from the 1993 Robert Wood Johnson Foundation survey, we investigate the effects of unionization on employer provision of health benefits. We find that in addition to increasing coverage by employer-provided health benefits, unions reduce employee cost sharing and substantially increase the probability that employer-provided health plans extend to retirees. The union effects on coverage for current employees and for retirees have risen over time, and our estimates suggest that declining unionization explains about 17-20 percent of the decrease in employer-provided health insurance between 1983 and 1997.Labor unions ; Insurance, Health

Liouville comparison theory for blowup of Euler-Arnold equations

In this article we introduce a new blowup criterion for (generalized) Euler-Arnold equations on $\mathbb R^n$. Our method is based on treating the equation in Lagrangian coordinates, where it is an ODE on the diffeomorphism group, and comparison with the Liouville equation; in contrast to the usual comparison approach at a single point, we apply comparison in an infinite dimensional function space. We thereby show that the Jacobian of the Lagrangian flow map of the solution reaches zero in finite time, which corresponds to $C^1$-blowup of the velocity field solution. We demonstrate the applicability of our result by proving blowup of smooth solutions to some higher-order versions of the EPDiff equation in all dimensions $n\geq 3$. Previous results on blowup of higher dimensional EPDiff equations were only for versions where the geometric description corresponds to a Sobolev metric of order zero or one. In these situations the behavior does not depend on the dimension and thus already solutions to the one-dimensional version were exhibiting blowup. In the present paper blowup is proved even in situations where the one-dimensional equation has global solutions, such as the EPDiff equation corresponding to a Sobolev metric of order two.Comment: 30 page

Zinc(II)-methimazole complexes: synthesis and reactivity

The tetrahedral S-coordinated complex [Zn(MeImHS)(4)](ClO4)(2), synthesised from the reaction of [Zn(ClO4)(2)] with methimazole (1-methyl-3H-imidazole-2-thione, MeImHS), reacts with triethylamine to yield the homoleptic complex [Zn(MeImS)(2)] (MeImS = anion methimazole). ESI-MS and MAS C-13-NMR experiments supported MeImS acting as a (N, S)-chelating ligand. The DFT-optimised structure of [Zn(MeImS)(2)] is also reported and the main bond lengths compared to those of related Zn-methimazole complexes. The complex [Zn(MeImS)(2)] reacts under mild conditions with methyl iodide and separates the novel complex [Zn(MeImSMe)(2)I-2] (MeImSMe = S-methylmethimazole). X-ray diffraction analysis of the complex shows a ZnI2N2 core, with the methyl thioethers uncoordinated to zinc. Conversely, the reaction of [Zn( MeImS)(2)] with hydroiodic acid led to the formation of the complex [Zn(MeImHS)(2)I-2] having a ZnI2S2 core with the neutral methimazole units S-coordinating the metal centre. The Zn-coordinated methimazole can markedly modify the coordination environment when changing from its thione to thionate form and vice versa. The study of the interaction of the drug methimazole with the complex [Zn(MeIm)(4)](2+) (MeIm = 1-methylimidazole) - as a model for Zn-enzymes containing a N-4 donor set from histidine residues shows that methimazole displaces only one of the coordinated MeIm molecules; the formation constant of the mixed complex [Zn(MeIm)(3)(MeImHS)](2+) was determined

The effect of an employer health insurance mandate on health insurance coverage and the demand for labor: evidence from Hawaii

Over the past few decades, policy makers have considered employer mandates as a strategy for stemming the tide of declining health insurance coverage. In this paper we examine the long term effects of the only employer health insurance mandate that has ever been enforced in the United States, Hawaii's Prepaid Health Care Act, using a standard supply-demand framework and Current Population Survey data covering the years 1979 to 2005. During this period, the coverage gap between Hawaii and other states increased, as did real health insurance costs, implying a rising burden of the mandate on Hawaii's employers. We use a variant of the traditional permutation (placebo) test across all states to examine the magnitude and statistical properties of these growing coverage differences and their impacts on labor market outcomes, conditional on an extensive set of covariates. As expected, the coverage gap is larger for workers who tend to have low rates of coverage in the voluntary market (primarily those with lower skills). We also find that relative wages fell in Hawaii over time, but the estimates are statistically insignificant. By contrast, a parallel analysis of workers employed fewer than 20 hours per week indicates that the law significantly increased employers' reliance on such workers in order to reduce the burden of the mandate. We find no evidence suggesting that the law reduced employment probabilities.Insurance, Health ; Employment ; Hours of labor ; Wages

A low accretion efficiency of planetesimals formed at planetary gap edges

Observations and models of giant planets indicate that such objects are enriched in heavy elements compared to solar abundances. The prevailing view is that giant planets accreted multiple Earth masses of heavy elements after the end of core formation. Such late solid enrichment is commonly explained by the accretion of planetesimals. Planetesimals are expected to form at the edges of planetary gaps, and here we address the question of whether these planetesimals can be accreted in large enough amounts to explain the inferred high heavy element contents of giant planets. We performed a series of N-body simulations of the dynamics of planetesimals and planets during the planetary growth phase, taking gas drag into account as well as the enhanced collision cross section caused by the extended envelopes. We considered the growth of Jupiter and Saturn via gas accretion after reaching the pebble isolation mass and we included their migration in an evolving disk. We find that the accretion efficiency of planetesimals formed at planetary gap edges is very low: less than 10% of the formed planetesimals are accreted even in the most favorable cases, which in our model corresponds to a few Earth masses. When planetesimals are assumed to form beyond the feeding zone of the planets, extending to a few Hill radii from a planet, accretion becomes negligible. Furthermore, we find that the accretion efficiency increases when the planetary migration distance is increased and that the efficiency does not increase when the planetesimal radii are decreased. Based on these results, we conclude that it is difficult to explain the large heavy element content of giant planets with planetesimal accretion during the gas accretion phase. Alternative processes most likely are required, such as accretion of vapor deposited by drifting pebbles