Indiana University-Purdue University Indianapolis (IUPUI) / It is not a new phenomenon that there is a high turnover rate among social workers. In particular, child welfare has shown the highest rates of staff turnover. To address the issue, turnover and retention of child welfare workers have been studied for decades. The history of research produced a long list of determinants for child welfare worker turnover, more than 20 factors, and showed conflicting findings with the same variables. Moreover, the long list of factors for workers’ decisions to leave has poorly contributed to organizational practices for retaining child welfare workers. Therefore, this study aims to examine organizational factors, particularly leadership, for child welfare worker turnover intention, in order to help child welfare agencies to invent a practice model to prevent qualified worker’s turnover. To do so, it is important to examine the effect of organizational commitment on employees’ turnover intention. Therefore, following is the primary research question: Does the use of transformational leadership style in social work organizations explain child welfare worker turnover intention? A cross-sectional survey research was employed among workers in public child welfare agencies in a Midwest state, United States (N=214). Five models were examined in terms of the direct and indirect effects of transformational leadership on turnover intention of child welfare workers using STATA ver. 15. The study finding showed that transformational leadership styles of local office directors had a direct and negative effect on child welfare workers’ turnover intention. As a result, this study recommends that child welfare provide local office directors with leadership training to reduce preventable turnover of child welfare workers. However, the findings should be cautiously interpreted due to the sampling strategy used in this study.

Texas Child Protective Services has been struggling with keeping its workers. The turnover rate, which measures the frequency of workers quitting and entering the agency, has been extremely high since the 1980s. In 2012, CPS reported that about one-fourth of its skilled workers are leaving the agency. This puts extra burden on the remaining workers, eventually leading them to resign as well. To fix the turnover issue, the state of Texas initiated a major reform in CPS in 2006. Although the reform succeeded in improving the quality of work environment and other areas, it failed to bring down the turnover rate. To identify why the statewide reform had failed, former caseworkers share their experiences with the agency to reveal what causes the high turnover, the detrimental effects it has on children, and what should be done to reduce the rates. / text

Diese Dissertation besteht aus drei Aufsätzen, die zur empirischen Literatur über Beschäftigung und Löhne auf dem deutschen Arbeitsmarkt beitragen. Der erste Aufsatz untersucht die Auswirkungen eines großen und unerwarteten Zustroms von Migranten auf den westdeutschen Arbeitsmarkt zwischen 1988 und 1993 auf die Löhne und Beschäftigung der einheimischen Arbeitnehmer. Die Analyse zeigt, dass ein Anstieg der lokalen Beschäftigung von Migranten die durchschnittlichen Löhne und Beschäftigung kurzfristig reduziert, der Effekt langfristig jedoch verschwindet. Der zweite Aufsatz analysiert den kausalen Effekt einer Lockerung des deutschen Kündigungsschutzgesetzes (KSchG) im Jahr 2004 auf unterschiedliche Arbeitsmarktergebnisse auf Firmenebene. Dazu nutzt der Aufsatz eine Änderung des Schwellenwerts der Mindestbetriebsgröße zur Anwendbarkeit des KSchG von fünf auf zehn Beschäftigte als ein Quasi-Experiment. Die Ergebnisse der empirischen Analyse liefern keine robuste Evidenz für einen Effekt auf die Einstellungs-, Abgangs-, Nettobeschäftigungs- und Churning-Raten sowie auf Löhne und temporäre Beschäftigung. Dagegen gibt es Evidenz, dass die Einstellungs- und Nettobeschäftigungsraten von Frauen zugenommen haben. Der dritte Aufsatz untersucht die Entwicklung der MINT-Beschäftigung und -Löhne in Westdeutschland zwischen 1980 und 2010. Die Analyse deutet auf einen Anstieg der MINT-Beschäftigung und -Löhne, der zeitlich mit dem Anstieg der Lohnungleichheit zusammenfällt. Darüber hinaus zeigt der Aufsatz, dass die Zunahme des Lohnunterschieds zwischen MINT und nicht-MINT Arbeitern durch Angebots- und Nachfragefaktoren im Rahmen eines MINT-verzerrten technologischen Wandels auf Basis einer CES-Produktionsfunktion erklärbar ist. Zuletzt deutet eine alternative Analyse der MINT-Prämie unter Nutzung von Schätzwerten aus einem Modell mit additiven Arbeiter- und Firmeneffekten darauf hin, dass der durch Firmeneffekte erklärte Anteil der MINT-Prämie mit der Zeit bedeutend zugenommen hat. / This thesis consists of three essays that contribute to the empirical literature on employment and wages in the German labor market. The first essay investigates the impact of a large and unexpected inflow of immigrants into the West German labor market between 1988 and 1993 on native wages and employment. The analysis indicates that an increase in local immigrant employment reduces average native wages and employment in the short run; however, the effect tends to vanish in the longer term. The second essay analyzes the causal effect of a relaxation of the German Protection Against Dismissal Act (PADA) in 2004 on different labor market outcomes at the firm level. Specifically, the essay exploits a change of the minimum establishment size threshold determining coverage by the PADA from five to ten employees as a quasi-experiment. The results from the empirical analysis do not provide robust evidence for an effect on overall hiring, separation, job flow, and churning rates as well as wages and temporary employment. However, there is some evidence of increases in the hiring and job flow rates of women. The third essay studies trends in STEM employment and wages in West Germany between 1980 and 2010. The analysis indicates an increase in STEM employment and wages that coincides with the rise in wage inequality during the same period. Moreover, the essay shows that the increase in the wage differential between STEM and non-STEM workers can be explained by supply and demand factors under a STEM-biased technological change within a CES production framework. Finally, an alternative assessment of the STEM premium exploits estimates from a model with additive worker and firm fixed effects and suggests that the fraction of the STEM premium that is explained by firm effects has increased considerably over time.