Increased competition between territorial governments is one of the institutional changes of greatest importance in Spain since the early 1980s. This study covers the different aspects of fiscal co-responsibility (the theoretical framework, comparative analysis, proposals for organization, existing experiences, effects on inter-regional solidarity, and coordination of the funding system) with the aim of helping to create a definitive profile of the fiscal co-responsibility of the autonomous regions. It also contains an assessment of the current system of funding in the period 1987-1991. This book includes the presentations made at the conference on Fiscal Co-responsibility in a Regionalized State, which the BBV Foundation organized in Madrid in 1993.