Thesis: Ph. D., Massachusetts Institute of Technology, Department of Economics, 2016.Cataloged from PDF version of thesis.Includes bibliographical references (pages 128-136).This thesis studies consumer behavior and strategic interactions between firms in markets that were actively designed by governments. In such settings, government intervention is frequent, firms are often constrained in their actions, and consumer behavior may depart from what is predicted by the standard set of assumptions. The chapters of this thesis study how the current set of regulations is affecting market outcomes in different settings and what can be done to improve them. Chapter 1 studies the Chilean pension system, where workers' mandatory contributions are ad...