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Electricity needs to be consumed at the very moment of production, leading wholesale prices to fluctuate widely at (sub-)hourly time scales. This article investigates the response of aggregate electricity demand to such price variations. Using wind energy as an instrument, we estimate a significant and robust short-term price elasticity of about −0.05 in Germany and attribute this to industrial consumers. As the share of consumption that is exposed to real-time prices (currently less than 25%) expands, we expect the aggregated price elasticity to grow.
We study the effect of Facebook and Instagram access on political beliefs, attitudes, and behavior by randomizing a subset of 19,857 Facebook users and 15,585 Instagram users to deactivate their accounts for 6 wk before the 2020 U.S. election. We report four key findings. First, both Facebook and Instagram deactivation reduced an index of political participation (driven mainly by reduced participation online). Second, Facebook deactivation had no significant effect on an index of knowledge, but secondary analyses suggest that it reduced knowledge of general news while possibly also decreasing belief in misinformation circulating online. Third, Facebook deactivation may have reduced self-reported net votes for Trump, though this effect does not meet our preregistered significance threshold. Finally, the effects of both Facebook and Instagram deactivation on affective and issue polarization, perceived legitimacy of the election, candidate favorability, and voter turnout were all precisely estimated and close to zero.
The average revenue, or market value, of wind and solar energy tends to fall with increasing market shares, as is now evident across European electricity markets. At the same time, these markets have become more interconnected. In this paper, we empirically study the multiple cross-border effects on the value of renewable energy: on one hand, interconnection is a flexibility resource that allows to export energy when it is locally abundant, benefitting renewables. On the other hand, wind and solar radiation are correlated across space, so neighboring supply adds to the local one to depress domestic prices. We estimate both effects, using spatial panel regression on electricity market data from 2015 to 2023 from 30 European bidding zones. We find that domestic wind and solar value is not only depressed by domestic, but also by neighboring renewables expansion. The better interconnected a market is, the smaller the effect of domestic but the larger the effect of neighboring renewables. While wind value is stabilized by interconnection, solar value is not. If wind market share increases both at home and in neighboring markets by one percentage point, the value factor of wind energy is reduced by just above 1 percentage points. For solar, this number is almost 4 percentage points.
During campaigns for legislative elections, a large portion of the general public follows televised debates between the front-running candidates. How can the candidates use the public interest in the debates to increase the support for their party? In this article, we argue that especially challenger candidates can improve the public perception of their valence qualities, such as personal integrity, leadership, and competence, and can - as a result - improve the support of their parties. We expect the perceived policy stances of the candidates to matter less, as parties often already have well-defined policy profiles that matter to voters. Building on televised debate experiments during the German Federal Elections of 2009 and 2013, we analyse the effect of the debates on party vote and in how far this relationship is mediated by changes in valence and policy evaluations of the candidates. Results show that changes of candidate valence, but not changes in policy perceptions, of the social-democratic front-running candidates mediate the vote intention for the party. Respondents who perceived the candidates more competent, empathetic and have integrity as a result of the debate are more likely to vote for their party. Our analysis further reveals, however, that this valence effect does not carry-over to vote intention briefly before the election.
This paper studies a key element of discrimination, namely, when stereotypes translate into discriminatory actions. Using a hiring experiment, we rule out taste-based discrimination by design and test for the presence of two types of belief-based gender discrimination. We document evidence of explicit discriminators—individuals who are willing to discriminate even when their hiring choices are highly revealing of their gender-biased beliefs. Crucially, we also identify implicit discriminators—individuals who do not discriminate against women when taking a discriminatory action is highly revealing of their biased beliefs, but do discriminate against women when their biased motive is obscured. Our analysis highlights the central role played by features of the choice environment in determining whether and how discrimination will manifest. We conclude by discussing the implications for policy design.
Organizational diversity of social-mission platforms: Advancing a configurational research agenda
(2024)
Social-mission platforms (SMPs), or platforms that facilitate the interactions between stakeholders across sectors and help them exchange resources to make progress on social and environmental problems, have emerged on a global scale. However, despite their prevalence, little is known about how SMPs organize to orchestrate collective efforts of social innovation. Taking stock of information systems and organizational literature on platforms, we identify four dimensions inherent in platform organizing (i.e., identity, boundary, governance, and technology). We then analyze three case studies to interrogate how these organizing dimensions manifest in SMPs. As a result, we offer a conceptual framework highlighting the trade-offs SMPs face, specifying the design choices they can make, and exposing the interdependences between dimensions. We further illustrate how these interdependences inform a configurational perspective of SMPs and suggest avenues to advance a configurational research agenda to deepen understanding of SMPs as effective vehicles to address Grand Challenges.
Objectives
In aging societies, more people become vulnerable to experiencing cognitive decline. Simultaneously, the role of grandparenthood is central for older adults and their families. Our study investigates inequalities in the level and trajectories of cognitive functioning among older adults, focusing on possible intersectional effects of social determinants and grandparenthood as a life course transition that may contribute to delaying cognitive decline.
Methods
Using longitudinal data from the Survey of Health, Ageing and Retirement in Europe, we analyzed a sample of 19,953 individuals aged 50-85 without grandchildren at baseline. We applied Multilevel Analysis of Individual Heterogeneity and Discriminatory Accuracy to investigate variation in cognitive functioning across 48 intersectional strata, defined by sex/gender, migration, education, and occupation. We allowed the impact of becoming a grandparent on cognitive functioning trajectories to vary across strata by including random slopes.
Results
Intersectional strata accounted for 17.43% of the overall variance in cognitive functioning, with most of the stratum-level variation explained by additive effects of the stratum-defining characteristics. Transition to grandparenthood was associated with higher cognitive functioning, showing a stronger effect for women. Stratum-level variation in the grandparenthood effect was modest, especially after accounting for interactions between grandparenthood and the stratum-defining variables.
Discussion
This study highlights the importance of social determinants for understanding heterogeneities in older adults’ level of cognitive functioning and its association with the transition to grandparenthood. Cumulative disadvantages negatively affect cognitive functioning, hence adopting an intersectional lens is useful to decompose inequalities and derive tailored interventions to promote equal healthy aging.
This dissertation delves into the complex dynamics of U.S. nuclear weapon deployments. Scholarly work on nuclear weapons has predominantly focused on strategic forces. However, many escalation scenarios foresee the use of tactical nuclear weapons as a precursor, which could eventually lead to an all-out nuclear war. These are exactly the weapons that the United States has deployed across the world, and we know little about their strategic causes and consequences. My study addresses this gap in the literature.
The first part of this dissertation investigates the causes of U.S. nuclear weapon deployments. It emphasizes the importance of assurance, which has commonly been neglected or subsumed under non-proliferation. Through a comprehensive conceptualization, I distinguish assurance from other strategies of interstate interaction, explaining how the U.S. uses nuclear weapon deployments to assure allies and maintain its sphere of influence. Utilizing an original dataset, I find evidence that largely confirms my assurance hypotheses. With regard to alternative explanations, the power projection hypotheses are supported, but the extended deterrence hypotheses are not. These results contribute to the underdeveloped literature on assurance and provide valuable insights into the strategic considerations underlying U.S. nuclear weapon deployments.
The second part, which is co-authored with Julian Wucherpfennig, examines the consequences of U.S. military deployments, both conventional and nuclear. The theory of free-riding in military alliances postulates that member states piggyback on security commitments by guardian states. We argue that free-riding critically implies that foreign military deployments positively affect subjective feelings of security – in other words: that they assure. In contrast, if citizens hold skeptical views of the guardian or do not subscribe to the (extended) deterrence logic, they might experience an increase in threat perception. We investigate how foreign military deployments impact attitudes toward defense policies in host states through an observational data analysis and a survey experiment. While nuclear and conventional troop deployments decrease citizens’ subjective need for defense, they do not necessarily increase their sense of protection, challenging the logic of free-riding.
Taken together, my findings suggest a mismatch between objectives and outcomes. While I find evidence that nuclear weapons are deployed to assure allies, this aim does not appear to be effective at the micro-level.
Residential buildings directly contribute 11% to local greenhouse gas emissions and up to 40% of total emissions when accounting for energy use for electricity generation. In order to achieve the climate targets in line with the Federal Climate Protection Act, increased ambition level of climate policy instruments is required in this sector. In this research, we are interested in the governance of this sector and the role of evaluation: the government-mandated processes used to evaluate policy in terms of the actors, organisations and ministries involved in executing and coordinating these processes; and the metrics and methods as well as the scope and granularity of evaluations.
The report follows a mixed methods research design, utilising multiple sources of primary data for triangulation. We combine 14 expert interviews with content analysis of published reports to investigate the quality and scope of the current evaluation procedures in place. Building on institutional and evaluation literatures, the research offers an enhanced understanding of the content, scope and processes of ex-post evaluation of policy instruments.