Discussing the nature of some key indirect and induced economic impact of dam projects and the available methodologies for their assessment, the present study makes an ex-post evaluation of their magnitude in the case 3 large projects—Bhakra Dam (India), Aswan High Dam (Egypt) and Sobradinho Dam (Brazil), and one small project—Bunga Dam (India). Besides providing a comparative analysis of the multiplier impact of these four cases and identifying the lessons that can be drawn from them, the book places the work done in a proper political and economic context and lists some further issues on which more work needs to be done.