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This doctoral thesis examines how European merger control law is applied to the energy sector and to which extent its application may facilitate the liberalisation of the electricity, natural gas and petroleum industries so that only those concentrations will be cleared that honour the principles of the liberalisation directives (IEMD and IGMD ). In its communication on an energy policy for Europe, adopted on 10/01/2007, the Commission emphasized that a real internal European energy market is essential to meet Europe’s three energy objectives, i.e. competitiveness to cut costs for citizens and undertakings to foster energy efficiency and investment, sustainability including emissions trading, and security of supply with high standards of public service obligations (Art. 106 TFEU). The EU issued three pre-liberalisation directives since the 1990s. Dissatisfied with the existing monopolistic structures, i.e. in Germany through demarcation and exclusive concession agreements for the supply of electricity and natural gas, which were until 1998 exempted from the cartel prohibition provision (§ 1 GWB), and the prevalence of exclusive rights on the energy markets, the Commission triggered infringement proceedings against four member states under Art. 258 TFEU. The CJEU confirmed that the Commission has the power to abolish monopoly rights under certain circumstances and the rulings had the effect of convincing the member states to enter into negotiations for an opening up of energy markets owing to the internal market energy liberalization directives of 1996 / 1998 / 2003 / 2009 / 2019 (IEMD and IGMD) . The core element of the IEMD and IGMD is to abolish exclusive rights and offer primarily at least large industrial electricity and gas consumers to choose their supplier (market opening for eligible consumers) and to grant negotiated or regulated third party access to transmission and distribution grids so to address natural monopolies. The second liberalization package of 2003 brought a widening of market opening and acceleration of pace of market opening to a greater number of eligible customers (all non-household consumers since July 2004 and all consumers since July 2007) and an increase in the provisions on management and legal unbundling. In parallel, two regulations regulate the access to cross-border electricity infrastructure (interconnectors) and the third party access to gas transmission networks. Two further Directives addressed the security of natural gas and power supply and a third deals with energy end use efficiency and services , a fourth dealt with the promotion of co-generation and a fifths covers marine environmental policy (Marine Strategy Framework Directive in combination with the Hydrocarbons-Licensing Directive ) backed by the public procurement directive in the energy sector. A regulation covers energy statistics. The implementation of the second energy package was slow and the Commission launched infringement proceedings against 5 member states in front of the CJEU (Art. 258, 256 TFEU). The 3rd energy package of 2009 addressed ownership unbundling of key-infrastructure ownership and energy wholesale and retail supply consisting of three regulations and two directives, deals with independent regulators, an agency for the cooperation of energy regulators (ACER) and cross-border cooperation (the European Network for transmission system operators for electricity and gas [ENTSO-E/G] and a regulation on cross-border grid access for electricity and natural gas. Another new regulation deals with market integrity and transparency . Hence, new regulations regulate guidelines on electricity balancing, congestion management, long-term capacity allocation, the code for grid access and transmission system operation . Other regulations address the guidelines for a European cross-border energy infrastructure, which has to be interpreted in the context of European environmental impact assessment law, the submission of data in electricity markets, establish a network code on demand connection , rule on a network code for grid access for direct current transmission systems, define guidelines on electricity transmission system operation, regulate a network code on electricity emergency , deal with security of natural gas supply and establish a programme to aid economic recovery by granting financial assistance. Finally, Directives promote the usage of renewable energies, regulate common oil stocks, the safety of offshore oil and gas production and the quality of petrol and diesel fuels. The 4th liberalization package consists of a new IEMD2019 and IGMD2019, of a new regulation on European cross-border electricity trade, of a regulation on risk preparedness in the electricity sector, of a new agency for the cooperation of European energy regulators, addresses energy efficiency and rules on good governance in the energy union. Since 2008, the Art. 194 I-II TFEU governs the ordinary legislation procedure in the energy sector (internal market in energy, security of energy supply, energy efficiency, energy saving, renewable energies, interconnection of energy grids) notwithstanding of unanimous decision making in case of energy taxation matters (Art. 194 III TFEU). A brief analysis of the economic implications of concentrations is followed by an assessment of the evolution of European merger control law under Art. 66 ECSCT, Art. 101 and 102 TFEU, the merger control regulation of 1989 and its significant amendments of 1997 and 2004. Then, the theoretical findings are contrasted to the results of recent merger proceedings in the energy sector with a focus on the VEBA/VIAG decision. Several deficiencies are established which limit the efficacy of merger control as a tool of offsetting shortcomings in the secondary EC law with regard to the liberalisation of the electricity and gas supply industry (IEMD and IGMD). Commitments proposed by the parties of a given concentration and accepted by the Commission as being sufficient to remedy a serious potential of dominance may only be of subsidiary relevance to the liberalisation of sectors owing to a number of analytical and practical drawbacks. One dominant drawback relates to the fact that the commitments depend always on parties' proposals and can never be imposed ex officio. Others relate to the blunt authorisations provided by the wording of Art. 6 and 8 MR1997 and MR2004 as to the implementation of undertakings. With regard to acquisitions of U.K. regional electricity companies by EdF, it is elaborated that the current merger control law leaves no scope for reciprocity considerations regarding acquisitions by incumbent companies in liberalised markets even though the acquirer is a protected public undertaking. Moreover, it is established that different decisions apply inconsistent market definitions. By means of the VEBA/VIAG and RWE/VEW cases, the question is addressed which causes are responsible for the established analytical and practical deficiencies of merger control in the energy sector. It is stated that the weaknesses of the IEMD 2009/72/EC and IGMD 2009/73/EC are partly responsible for weak undertakings which do not sufficiently remove the scope for dominance on the affected markets and which do not rule out any possibility of impediments of effective negotiated or regulated TPA and do not remove any commercial incentive of the grid subsidiaries of the vertically integrated companies as to access which discriminates between intra and extra group applicants. It is reported that another argument relates to the limited scope that the Commission has if it wants to remedy deficiencies of written primary law owing to the extraordinary nature of the implied powers doctrine based on the principle of constitutional state. Adverse political influence against competition authorities is also judged. Further, it is analysed that accidental regulation based on incidental provisions imposed on undertakings which may or not implement a concentration is by no means a consistent and non-discriminatory and predictable tool to overcome drawbacks of primary or secondary European law in a given sector owing to the democratic principle and the constitutional state doctrine. It is discussed that secondary legislation with regard to energy networks is inter alia restricted by Art. 345 TFEU and provisions of national constitutions which protect property rights against dis-proportionate expropriations or re-definitions of property. Further, legal authorisations of said calibre will have to be connected to a system of state liability law. Adverse political pressures are considered. The same is true for egoistic national policies which abstain from transnational task forces in order to settle difficulties and disputes. Furthermore, the adverse effect of different stages of the maturity of domestic markets, different consumer patterns and a potential isolation of the system is not neglected, because these conditions make it more difficult to apply consistent standards as to the appropriate market definition in order to facilitate harmonisation. The implementation of the VEBA/VIAG merger is discussed, as the former was further complicated owing to specifically evaluated circumstances which were difficult to predict. Nevertheless, the Commission is not exempted from the duty to take due care concerning potential impediments as to the realisation of parties' commitments. In contrast to the negative aspects, it can be highlighted that the Commission quickly realised flaws of the energy liberalisation project as expressed by the present form of the IEMD and IGMD. Consequently, the co-ordinative and innovative mechanisms of Florence and Madrid were created in order to boost the development of effective cross border trade - i.e. tariff systems and interconnector congestion management. It will be concluded that undertakings put forward by the parties and accepted by the Commission should be restricted to a subsidiary legal instrument, only applied if strictly necessary to overcome certain detrimental aspects of given concentrations in order to provide a hint for the legislator, to specify its legislation. Competition as a de-central distributor of risk, wealth and power will be extended to its maximum extent, if wholesale consumers benefit from lower energy prices which allow greater productivity of European products on the world markets in combination with higher environmental standards owing to modern, cost-efficient plants. A successful implementation will be described by liquid spot markets for power accompanied by tools of financial risk management like forwards, futures and options. These will be valuable indicators of efficient liberalisation of the European electricity and gas supply industries.

Despite growing research on sustainability transformations, our understanding of how transformative transdisciplinary research can support local actors who foster change towards sustainability is still somewhat limited. To contribute to this research question, I conducted research in a transdisciplinary case study in Southern Transylvania, where non-governmental organizations (NGO) drive sustainability initiatives to foster desired changes (e.g., supporting small-scale farmers or conserving natural and cultural heritage). Interactions with these local actors and reflections on my research question shaped the research of this dissertation, which I present in four papers. In paper 1, I conducted a literature review on amplification processes that describe actions, which local actors can apply to increase the impact of their sustainability initiatives. This is of interest in sustainability transformations research and practice because the impact of initiatives challenges incumbent regimes and consequently prepares transformations. I developed an integrated typology of amplification processes, which introduces new and innovative ways to conceptualize and study how initiatives increase their impact. The typology integrates theoretical insights on amplification processes from different frameworks that draw on diverse theories, such as resilience theory on transformations of social-ecological systems or sustainability transitions theory on transitions of socio-technical systems. This typology combines contemporary conceptualizations of amplification processes, informs transdisciplinary researchers working with local actors on increasing impact from initiatives, and has inspired debate and empirical research which contributes to theory development concerning amplifying impact of initiatives in diverse contexts. In paper 2, I conducted a literature review on the application of indigenous and local knowledge (ILK) in sustainability transformations research to understand whether this research engages with the conceptualization of transformations from local actors. The results show that ILK is generally applied to confirm and complement scientific knowledge in contexts of environmental, climate, social-ecological, and species change. Only four out of 81 papers (5%) applied ILK to conduct research on transformations. In addition, I identified four research clusters that apply ILK in contexts of transformation, transition, or change in Arctic, terrestrial, coastal, and grass and rangelands environments. Consequently, the review shows that only few empirical studies apply ILK to understand transformations. This indicates that sustainability transformations research lacks to include knowledge from local actors to conceptualize transformations, such as in the case of ILK. This has the potential to question scientific conceptualizations of transformations for theory development (e.g., resilience theory on transformations of social-ecological systems) and to enrich transformative transdisciplinary research. In paper 3, I derived principles that provide guidance for how to integrate sustainability initiatives from local actors in transformative transdisciplinary research. Based on my transdisciplinary research with the NGOs in Southern Transylvania and by using systems and futures thinking as an approach for analysis, I derived three principles that provide guidance for the co-design of sustainability intervention strategies that build on, strengthen, and complement existing initiatives from local actors. These principles contribute to transformative transdisciplinary research by highlighting and operationalizing the need to integrate initiatives from local actors to foster bottom-up, place-based transformations. In paper 4, I explored empirically how to identify relevant local actors for collaborations that seek to intervene in specific characteristics of a system (e.g., parameters or design of a system). I applied a leverage points’ perspective to analyse the social networks of the NGOs in Southern Transylvania that amplify the impact of their initiatives. My results suggest that there are two types of local actors for potential collaborations: local actors who have the ability to intervene in both shallow (i.e., parameters and feedbacks of a system) and deep (i.e., design and intent of a system) system characteristics, and local actors who have the ability to intervene only in specific system characteristics. In addition, my results indicate that the application of specific amplification processes is associated with the positions of local actors in their networks. Thus, paper 4 provides a novel methodological approach and first empirical insights for identifying potential relevant partners for specific system interventions. This supports in transformative transdisciplinary research the categorization of relations and networks of local actors according to the system characteristics that they address, and the selection of relevant partners for specific system interventions. This dissertation as a whole contributes insights to three recommendations of how transformative transdisciplinary research can support local actors fostering change towards sustainability: First, by conducting research that studies and supports local actors who increase the impact of their sustainability initiatives via amplification processes (Paper 1 and 4); Second, by engaging specifically with the initiatives, networks, and knowledge from local actors, who foster bottom-up, place-based transformations (Paper 1-4); Third, by identifying and collaborating with local actors that are relevant for strategic systems interventions that build on, strengthen, and complement existing initiatives (Paper 3-4). These three recommendations pave the way for an enhanced transformative transdisciplinary research that can potentially support local actors who with their initiatives, networks, and knowledge foster bottom-up, place-based sustainability transformations.

This doctoral thesis contains four empirical studies analysing the personal accountability of prime ministers and the electoral presidentialisation of parliamentary elections in European democracies. It develops the concept of presidentialised prime ministerial accountability as a behavioural element in the chain of accountability in parliamentary systems. The ongoing presidentialisation of parliamentary elections, driven by changes in mass communication and erosion of societal cleavages, that fosters an increasing influence of prime ministers’ and other leading candidates’ personalities on vote choices, has called performance voting – and the resulting accountability mechanism of electoral punishment and reward of governing parties – into question. This thesis analyses whether performance voting can be extended to the personal level of parliamentary governments and asks whether voters hold prime ministers personally accountable for the performance of their government. Furthermore, it explores how voters change their opinion of prime ministers and how differences in party system stability and media freedom between Western and Central Eastern Europe contribute to higher electoral presidentialization in Central Eastern European parliamentary elections. This thesis relies on several national data sources: the ‘British Election Study’, the ‘German Longitudinal Election Study’ and other German election surveys, the ‘Danish Election Study’, as well as, data from the ‘Forschungsgruppe Wahlen’. In addition, it utilises cross-national data from the ‘Comparative Study of Electoral Systems’. The findings contribute to the ongoing scholarly debate on the issue of accountability and electoral presidentialisation in parliamentary systems by providing extensive evidence on prime ministerial accountability under presidentialised electoral behaviour. Keywords: presidentialisation; prime ministers; voting behavior; accountability; personalisation.

My dissertation embraces four empirical papers addressing socio-economic issues relevant to policy-makers and society as a whole. These papers cover important aspects of human life including health at birth, life satisfaction, unemployment periods and retirement decisions, and are intended to provide a contribution to the respective research areas. The analyses are carried out applying advanced econometric methods and are based on data sets consisting of survey data as well as administrative records. The joint paper with Alessandro Palma and Daniela Vuri "Prenatal Air Pollution Exposure and Neonatal Health" in Chapter 2 investigates the causal impact of prenatal exposure to air pollution on neonatal health in Italy in the 2000s combining detailed information on mother’s residential location from birth certificates with PM10 concentrations from air pollution monitors. Variation in local weekly rainfall is exploited as an instrumental variable for non-random air pollution exposure. Using quasi-experimental variation in rainfall shocks allows to identify the effect of PM10, ruling out potential bias due to confounder pollutants. The paper estimates the effect of exposure for both the entire pregnancy period and separately for each trimester to test whether the neonatal health effects are driven by pollution exposure during a particular gestation period. This information enhances our understanding of the mechanisms at work and help prevent pregnant mothers from most dangerous exposure periods. Additionally, the effects of prenatal exposure to PM10 are estimated by maternal labor market status and maternal education level to understand how the pollution burden is shared across different population groups. This decomposition allows to identify possible mechanisms through which environmental inequality reinforces the negative impact of early-life exposure to air pollution. This study finds that average PM10 and days with PM10 level above the hazard limit reduce birth weight, gestational age, and measures of overall newborn health. Effects are largest for third trimester exposure and for low-income and less educated mothers. These findings imply that further policy efforts are needed to fully protect fetuses from the adverse effects of air pollution and to mitigate the environmental inequality of health at birth. The joint paper with Christian Pfeifer "Life Satisfaction in Germany After Reunification: Additional Insights on the Pattern of Convergence" in Chapter 3 updates previous findings on the total East-West gap in overall life satisfaction and its trend by using data from the German Socio-Economic Panel for the years 1992 to 2013. Additionally, the effects are separately analyzed for men and women as well as for four birth cohorts. The results indicate that reported life satisfaction is, on average, significantly lower in East than in West German federal states and that part of the raw East-West gap is due to differences in household income and unemployment status. The conditional East-West gap decreased in the first years after the German reunification and remained quite stable and sizable since the mid-nineties. The results further indicate that gender differences are small. Finally, the East-West gap is significantly smaller and shows a trend towards convergence for younger birth cohorts. The joint paper with Christian Pfeifer "Unemployment Benefits Duration and Labor Market Outcomes: Evidence from a Natural Experiment in Germany" in Chapter 4 explores the effects 2 of a major reform of unemployment benefits in Germany on the labor market outcomes of individuals with some health impairment. The reform induced a substantial reduction in the potential duration of regular unemployment benefits for older workers. This work analyzes the reform in a wider framework of institutional interactions, which allows to distinguish between its intended and unintended effects. The results based on routine data collected by the German Statutory Pension Insurance and a Difference-in-Differences design provide causal evidence for a significant decrease in the number of days in unemployment benefits and increase in the number of days in employment. However, they also suggest a significant increase in the number of days in unemployment assistance, granted upon exhaustion of unemployment benefits. Transitions to unemployment assistance represent an unintended effect, limiting the success of a policy change that aims to increase labor supply via reductions in the generosity of the unemployment insurance system. The single-authored paper "How Older Workers Respond to Raised Early Retirement Age: Evidence from a Kink Design in Germany" in Chapter 5 explores how an increase in the early retirement age affects labor force participation of older workers. The analysis is based on a social security reform in Germany, which raised the early retirement age over several birth cohorts to boost employment of older people and ultimately alleviate the burden on the public pension system. Detailed administrative data from the Federal Employment Agency allow to distinguish between employment and unemployment as well as disability pensions and retirement benefits claims. Using a Regression Kink design in a quasi-experimental framework, I show that the raised early retirement age had positive employment effects and negative effects on retirement benefits claims. The reform did not affect unemployment benefits or disability pensions claims. My results also show that some population groups are more sensitive to a reduction in retirement options and more likely to seek benefits from other government programs. In this respect, I find that workers in manufacturing sector respond to the raised early retirement age by claiming benefits from the disability insurance program designed to compensate for reduced earnings capacity due to severe health problems. The treatment heterogeneity analysis further suggests that high-wage workers are more likely to delay exits from employment, which is in line with incentives but might also indicate an increased inequality within the affected birth cohorts induced by the reform. Finally, women seem to rely on alternative sources of income such as retirement benefits for women, or spouse's or partner's income not observed in the data. All things considered, workers did not adjust to the increased early retirement age by substituting early retirement with other government programs but rather responded to the reform in line with the policy intent. At the same time, the findings point to heterogeneous behavioral responses across different population groups. This implies that raising the early retirement age is an effective policy tool to increase employment only among older people who have the real choice to delay employment exits. Therefore, reforms that raise statutory ages should ensure social support for workers only marginally attached to the labor market or not able to work longer due to potential health problems or other circumstances.