This dissertation consists of three essays in LaborEconomics. The first chapter estimates the costs for establishments of hires andseparations for a panel of German establishments. The panel records the start and thetermination of the employment of all employees in the surveyed establishments,...

In the first essay, we propose a nonparametric testing methodology for jump diffusion models of asset prices with stochastic volatility. We test various parametric specifications against a nonparametric alternative. The test statistic is constructed using the transition densities of the asset...