Part 1 Introduction, Kenneth A. Shepsle; Chapter 1 Theoretical Orientation; Part 2 Spatial Competition with Exogenous Agents; Chapter 2 Spatial Economic Competition; Chapter 3 MultiPart y Electoral Competition; Part 3 Spatial Competition with Endogenous Agents; Chapter 4 Spatial Economic Competition with Endogenous Agents; Chapter 5 Endogenizing Entry in Political Contests; Chapter 6 MultiPart y Electoral Competition; Part 4 Extensions and Conclusions; Chapter 7 MultiPart y Electoral Competition, Endogenous Agents, and Duverger’s Law; Chapter 8 Considerations of Government Formation; Chapter 9 Conclusions;