The Leadership Capital Index develops a conceptual framework of leadership capital and a diagnostic tool - the Leadership Capital Index (LCI) - to measure and evaluate the fluctuating nature of the leadership capital of leaders. Differing amounts of leadership capital, a combination of skills, relations and reputation, allow leaders to succeed or bring about their failure. This book brings together leading international scholars in the field to engage with the concept of 'leadership capital' and use and apply the LCI to a variety of comparative case studies. The book provides an important, timely, and innovative contribution to the now flourishing academic discipline of political leadership studies. The LCI offers a comprehensive yet parsimonious and easily applicable 10 point matrix to examine leadership authority over time and in different political contexts. In each case, leaders 'spend' and put their 'stock' of authority and support at risk. United States president Lyndon Johnson arm-twisting Congress to put into effect civil rights legislation; Tony Blair taking the United Kingdom into the invasion of Iraq; Angela Merkel committing Germany to a generous reception of refugees: all 'spent capital' to forge public policy they believed in. The volume examines how office-holders acquire, consolidate, risk, and lose such capital, and concentrates predominantly on elected 'chief executives' at the national level, including majoritarian and consensus systems, multiple and singular cases, and also examines some presidential and sub-national cases. The Leadership Capital Index is an exploratory volume, with chapters providing a series of plausibility probes to see how the LCI framework 'performs' as a descriptive and analytical tool.