Abstract
The chapter attempts to highlight the challenges that arise in the chapters of this book when examining the interaction between diversity accommodation and fiscal federalism within the selected federal systems. It explores how the need to address diversities influences financial relations and their evolution, focusing on which types of diversity drive these dynamics, potentially leading to integrative or disintegrative effects for the federal system. To accomplish this, the chapter delves into three major critical areas: the cause-effect relationship between diversity and fiscal arrangements, the balance between financial autonomy and solidarity, and the participation of subnational governments in decision-making processes. Examples from the case studies analyzed in this book are used to illustrate the complexities of accommodating diversities through fiscal federalism