TY - JOUR TI - Essays on wages and earnings DO - https://doi.org/doi:10.7282/T3MG7N8M PY - 2012 AB - In this dissertation I first try to explain how the wage is determined from a theoretical perspective. Then I provide a test regarding a phenomenon which has not been well explained so far. Finally I turn to an important issue in studies on taxation. In the first chapter I provide models considering when firm sets wage either above or below the market clearing wage although previous models take as granted that the efficiency wage is above the market clearing wage. A simple model, the "selection model", is different from previous models in that the firm considers workers' choices on labor supply as an important factor when it makes decisions on wages and employment. I then set up the "effort model", in which the effort function is determined by the worker while the ability function is exogenously given the selection model. As a result, the models produce set of possible choices which resembles backward-bending labor supply curve. The shape helps explain the minimum wage paradox. In the second chapter I test whether efficiency wage models contribute to explaining interindustry wage differentials. First, I find two variables which could cause firms to pay different wages to seemingly identical workers: the internal and external reference wages. Then, I estimate wage equations with and without those variables, and find that those variables help explain interindustry wage differentials by reducing the standard deviation of wage differentials. In the final chapter I address a problem that study of the behavioral response to the changes in the individual tax rate always encounters: endogeneity. I first develop novel instruments for the marginal tax rate and net-of-tax rate (1 - marginal tax rate). Then, I run regression using the new instruments for the net-of-tax rate and also using either no instrument or an improper instrument. Regressions suggest that the tax rates are endogenous to income and replacing the tax rates with the counterfactual tax rates solves the endogeneity problem. They also imply that the tax rate changes have no significant effect on medium-income earners in the short run. KW - Economics KW - Wages KW - Economics LA - eng ER -