In politics, money is often the name of the game. Politicians enrich themselves while in office, spend campaign money to finance their re-election, and accept lucrative 'golden parachute' jobs after leaving office. Money in Politics argues that these different forms of capital are part of a common system and should be analyzed in a single framework. The book advances a comparative theory that shows how self-enrichment, campaign spending, and golden parachute jobs are connected to each other. This theory explains when and how money enters politics, ultimately illuminating that a change in one form affects the other types and revealing the consequences this has for democracy. The book uses a wide range of evidence from countries around the world, including causally identified quantitative studies, qualitative cross-national comparisons, and original survey experiments. Enlightening and instructive, this book shows that we can only fully comprehend the role of money in politics when we view it as a common system to be analyzed and critiqued.