This paper surveys the theoretical and empirical research on the efficient assignment of policy tasks to different levels of government and applies the results on the delimitation of competences within the European Union. The main results are: (i) A precise derivation of an optimal degree of decentralisation is not possible because of mixed theoretical suggestions. The adequate degree of decentralisation has to be detected case-by-case. (ii) Systematic evidence on direct relationships between economic performance and fiscal decentralisation is ambiguous and scarce. (iii) Comparing the de facto delimitation of EU-competences with the normative recommendations, remarkable discrepancies arise in the fields of agriculture and defence. (iv) The establishment of a flexible assignment-scheme by the European Convention is an undeniable necessity in order to guarantee reversibility and to cope efficiently with changing general conditions. (author's abstract) / Series: EI Working Papers / Europainstitut

This habilitation thesis consists of seven published journal articles and one published book chapter. Part I, consisting of chapter 1, introduces the overarching theme of environmental policy instruments and discusses the current use of and prospects for economic instruments in conservation policies. A number of research gaps are identified which are addressed in the subsequent chapters. Part II, consisting of chapters 2–5, encompasses four papers focused on a single type of policy instrument: intergovernmental fiscal transfers. Although well documented in public finance literature, intergovernmental fiscal transfers remain a somewhat neglected instrument in environmental policy. Despite being well suited to address the spillover benefits that often accrue with conservation policies, there is scant research literature on ecological fiscal transfers compared to other economic instruments such as environmental taxes or tradable permits. In fact, very few countries make practical use of them to achieve conservation objectives. Thus intergovernmental fiscal transfers are an innovative instrument in conservation policies in particular, so that advances in both theory and applied research may prove especially beneficial here. Part III, consisting of chapters 6–9, combines a number of articles in integrative biodiversity research and applied biodiversity governance, themes that are often neglected in the economic analysis of environmental policy instruments. However, when implementing policy instruments in societal settings, interdisciplinary research bridging the natural and social sciences is as much a prerequisite as policy-relevant research that responds to the needs of decision makers and other stakeholders. Both policy design and policy evaluation yield the best outcomes when they involve ecologists, economists, legal and other social scientists, as this ensures that consideration is given to ecological effectiveness, economic efficiency, administrative feasibility, social acceptance, and perception by stakeholders. Policy-relevant research also responds to current societal developments and prospective changes in legislation which may provide windows of opportunity to propose new instruments. Meanwhile, sound empirical research and case study design are indispensable in making concrete policy recommendations, taking into account existing formal and informal institutions.

This habilitation thesis consists of seven published journal articles and one published book chapter. Part I, consisting of chapter 1, introduces the overarching theme of environmental policy instruments and discusses the current use of and prospects for economic instruments in conservation policies. A number of research gaps are identified which are addressed in the subsequent chapters. Part II, consisting of chapters 2–5, encompasses four papers focused on a single type of policy instrument: intergovernmental fiscal transfers. Although well documented in public finance literature, intergovernmental fiscal transfers remain a somewhat neglected instrument in environmental policy. Despite being well suited to address the spillover benefits that often accrue with conservation policies, there is scant research literature on ecological fiscal transfers compared to other economic instruments such as environmental taxes or tradable permits. In fact, very few countries make practical use of them to achieve conservation objectives. Thus intergovernmental fiscal transfers are an innovative instrument in conservation policies in particular, so that advances in both theory and applied research may prove especially beneficial here. Part III, consisting of chapters 6–9, combines a number of articles in integrative biodiversity research and applied biodiversity governance, themes that are often neglected in the economic analysis of environmental policy instruments. However, when implementing policy instruments in societal settings, interdisciplinary research bridging the natural and social sciences is as much a prerequisite as policy-relevant research that responds to the needs of decision makers and other stakeholders. Both policy design and policy evaluation yield the best outcomes when they involve ecologists, economists, legal and other social scientists, as this ensures that consideration is given to ecological effectiveness, economic efficiency, administrative feasibility, social acceptance, and perception by stakeholders. Policy-relevant research also responds to current societal developments and prospective changes in legislation which may provide windows of opportunity to propose new instruments. Meanwhile, sound empirical research and case study design are indispensable in making concrete policy recommendations, taking into account existing formal and informal institutions.