This dissertation consists of three self-contained chapters on topics in urban economics. They complement each other by taking three different angles on what drives the decisions on where to live, and in chapter 2 and 3 also where to work.

1. A bibliometric analysis of what do unions do? -- 2. Research synthesis through meta-regression analysis -- 3. Unions and productivity : direct estimates -- 4. Unions and productivity growth -- 5. Unions and productivity : investment channels -- 6. Unions and productivity : employee behavior...