ESSAYS ON HETEROGENEOUS TREATMENT EFFECTS IN THE LABOR MARKET


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This dissertation includes three chapters. The first two chapters mainly focus on the effects of job displacement on earnings. The first chapter analyzes how the effects of job displacement on earnings vary among natives and immigrants in the United States, while the second chapter studies the distributional effects of job displacement using quantile regression and distribution regression. The third chapter considers the distributional effects of having children on women's income. In particular, I apply the Changes in Changes approach and distribution regression to study how the motherhood penalty varies across different women. Chapter 1, tilted THE HETEROGENEOUS EFFECTS OF JOB DISPLACEMENT ON IMMIGRANT AND NATIVE WORKERS, extends the previous literature by analyzing the consequences of job displacement on weekly earnings among natives and immigrants in the United States and also examines whether job displacement has different effects among native displaced workers residing in states with different share of immigrants' population. Although there are contradictory findings in the literature about how immigrants would respond to labor market shocks differently from natives, the existing literature agreed on the fact that workers who involuntarily lose their jobs experience long spells of unemployment after displacement. Fully understanding the consequences of job displacement among natives and immigrants, and the role of the share of immigrants' population on native displaced workers may help policy-makers to better formulate immigration policies as well as off-setting labor market policies for displaced workers. My results show that some groups of immigrants experience slightly smaller earning losses following displacement compared to natives, and I did not find significant effects of the share of immigrants on the earning loss of native displaced workers. Chapter 2, titled HETEROGENEOUS EFFECTS OF JOB DISPLACEMENT ON EARNINGS (with Brantly Callaway), considers how the effect of job displacement varies across different individuals. In particular, our interest centers on features of the distribution of the \textit{individual-level} effect of job displacement. Identifying features of this distribution is particularly challenging -- e.g., even if we could randomly assign workers to be displaced or not, many of the parameters that we consider would not be point identified. We exploit our access to panel data, and our approach relies on comparing outcomes of displaced workers to outcomes the same workers would have experienced if they had not been displaced and if they maintained the same rank in the distribution of earnings as they had before they were displaced. Using data from the Displaced Workers Survey, we find that displaced workers earn about \$157 per week less than they would have earned if they had not been displaced. We also find that there is substantial heterogeneity. We estimate that 42\% of workers have higher earnings than they would have had if they had not been displaced and that a large fraction of workers have substantially lower earnings than the average effect of displacement. Finally, we also document major differences in the distribution of the effect of job displacement across education levels, sex, age, and counterfactual earnings levels. Throughout the paper, we rely heavily on quantile regression. First, we use quantile regression as a flexible (yet feasible) first step estimator of conditional distributions and quantile functions that our main results build on. We also use quantile regression to study how covariates affect the distribution of the individual-level effect of job displacement. Chapter 3, titled THE HETEROGENEOUS EFFECTS OF HAVING CHILDREN ON WOMEN'S INCOME, estimates the distributional effects of having children on women's annual income in the United States using the National Longitudinal Survey of Youth from 1979 to 2016. Existing work on motherhood penalty shows that while the wage gap among men and women becomes smaller in the United States, the gap between mothers and childless women is increasing (\cite{waldfogel1998understanding}). After childbirth, women usually experience an immediate decrease in their earnings relative to what they would have earned if they had not become a mother. The gap closes somewhat over time though mothers never fully catch up to their counterfactuals. Previous work tried to explain the motherhood wage penalty by estimating the average treatment effect of children on women's earnings, but these effects can be quite heterogeneous across mothers with different observable characteristics. By utilizing the Changes-in-Changes model and distribution regression, I find that around 90\% of mothers have lower income after having children. White, married, older, and highly educated mothers with two or more children experience a substantial drop in their income.







Job Displacement


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Three Essays: Cross-National Comparisons of Labor Market Dynamics


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My dissertation studies labor market dynamics using detailed longitudinal household level data from multiple countries. The institutional differences among different countries make the cross-national comparisons particularly interesting. Chapter one examines the occupational mobility of workers between occupations that vary in the intensity of routine tasks in Britain and Germany. Chapter two studies the relationship between the worker's unobservable ability and the probability of involuntary job loss in four countries. Chapter three considers the impacts of job displacement on workers in Britain and Germany. Following the hypothesis of Routine-Biased Technical Change, chapter one reports a declining employment share of routine occupations in both Britain and Germany. In Britain, the slower growth of wage premia of routine occupations encourages routine workers witch to other occupations. Higher ability workers are more likely to upgrade to cognitive occupations, while lower ability ones are more likely to downgrade to manual occupations. However, in Germany, wage premia of cognitive occupations increased. Therefore, most workers move from routine occupations to more highly compensated cognitive ones in the face of automation. Chapter two investigates involuntary job loss in four countries--Britain, Germany, Korea and Switzerland. In all four countries, conditional on a vector of traditional observable attributes, lower ability workers are consistently more likely to experience involuntary job loss. In addition, I find unionization at the work place plays an important role in this mechanism. In Britain, Korea and Switzerland the union sector contributes almost all the effect while in Germany lower skilled workers in both unionized and non-unionized sectors are disproportionally more likely to lose jobs. Additionally, the impacts of job displacement in Britain and Germany are examined in chapter three. Losses of labor earnings are very similar four years after job loss. However, families in Germany seem to be able to better respond to the losses of earnings caused by a job displacement. The cross-national contrast is sharper when considering the additional role of government. In Germany, no statistically significant differences in post-government income are observed following job displacement while four years later, losses in family income remain at more than 10 percent in Britain.







Three Essays on Torts


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These essays illustrate the advantages of 'reflexive' tort scholarship by contrasting the reflexive scholarship of judicial analysis with grand theory, then applying reflexive scholarship to the tort of negligence. The final essay presents a wider argument about human responsibility and legal conduct.