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Referierte Aufsätze Web of Science
Introducing electricity purchase conditions in renewable fuel regulations and carbon accounting is a controversial issue in the US and Europe. We argue that their impact must be assessed considering demand flexibility, local grid conditions, and overlapping policy instruments such as emissions trading schemes and renewable portfolio standards. The introduction of more stringent requirements has a significant ...
In:
iScience
28 (2025), 5, 112349, 8 S.
| Lissy Langer, Kenneth Bruninx, Anders Bjørn, Lukas Barner, Julien Lavalley, Hadi Vatankhah Ghadim, Rasmus Bramstoft
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Referierte Aufsätze Web of Science
We show that in school systems with grade retention or redshirting birth cohort size is negatively related to the grade-level share of students who are too old for their grade. This compositional effect gives rise to an upward bias in estimates of class size effects based on commonly used research designs exploiting within-school variation in birth cohort size. Using data for all primary schools in ...
In:
Journal of Human Resources
60 (2025), 2, S. 578-606
| Maximilian Bach, Stephan Sievert
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Referierte Aufsätze Web of Science
During the 2022 energy crisis, electricity prices across Europe have risen to unprecedented heights. In a case study for Germany, this work investigates to which extent price spikes can be attributed to changes in upstream commodity prices, and to which degree strategic behavior by generators may have contributed to the situation. Electricity markets are more prone to the effects of such behavior if ...
In:
Energy Reports
13 (2025), S. 5474–5485
| Maria Krzywnicka, Lukas Barner
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Referierte Aufsätze Web of Science
Aligned with the war in Ukraine, Russia has significantly withheld natural gas exports to Europe since 2021. As there are no EU-wide sanctions on imports of Russian natural gas, the Ukraine transit as well as imports via Turkey and LNG have remained active during 2022–24. However, the Russian-Ukrainian transit agreement expires at the end of 2024 and discussions about new sanctions on natural gas as ...
In:
Energy Strategy Reviews
58 (2025), 101646, 10 S.
| Lukas Barner, Franziska Holz, Christian von Hirschhausen, Claudia Kemfert
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Referierte Aufsätze Web of Science
Techno-economic studies are investigating procurement costs of hydrogen and related derivatives across various international trade routes. However, the strategic behavior of exporters is rarely considered in this context, despite similar behavior frequently observed in the fossil fuel world and market characteristics indicating some potential. This work introduces a novel techno-economic model of oligopolistic ...
In:
Energy
311 (2024), 133284, 17 S.
| Lukas Barner
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Referierte Aufsätze Web of Science
We propose a test for time-varying impulse responses in heteroskedastic structural vector autoregressions that can be used when the shocks are identified by external proxy variables as a group but not necessarily individually. The test is robust to the identification scheme for identifying the shocks individually and can be used even if the shocks are not identified individually. The asymptotic analysis ...
In:
Journal of Economic Dynamics & Control
161 (2024), 104837, 15 S.
| Martin Bruns, Helmut Lütkepohl
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Referierte Aufsätze Web of Science
The transition away from a fossil-fuel powered economy towards a cleaner production system will create winners and losers in the global trade system. We compile a list of 'brown' traded products whose use is highly likely to decline if the world is to mitigate climate change, and explore which countries are most at risk of seeing their productive capabilities 'stranded'. Using methods from economic ...
In:
Environmental Research Letters
18 (2023), 4, 045004, 35 S.
| Pia Andres, Penny Mealy, Nils Handler, Samuel Fankhauser
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Referierte Aufsätze Web of Science
We propose a new bootstrap algorithm for inference for impulse responses in structural vector autoregressive models identified with an external proxy variable. Simulations show that the new bootstrap algorithm provides confidence intervals for impulse responses which often have more precise coverage than and similar length to the competing moving-block bootstrap intervals. An empirical example shows ...
In:
Computational Economics
62 (2023), S. 1857–1882
| Martin Bruns, Helmut Lütkepohl
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Referierte Aufsätze Web of Science
Studies of the crude oil market based on structural vector autoregressive (VAR) models typically assume a time-invariant model and transmission of shocks and possibly allow for heteroskedasticity by using robust inference procedures. We assume a heteroskedastic reduced-form VAR model with time-invariant slope coefficients and explicitly consider the possibility of time-varying shock transmission due ...
In:
Economics Letters
233 (2023), 111416, 5 S.
| Martin Bruns, Helmut Lütkepohl
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Referierte Aufsätze Web of Science
Green public procurement has gained high political priority and is argued to be an effective demand-side policy to trigger environmental innovations. However, the empirical evidence on its innovation impact is limited. We construct a novel firm-level dataset to investigate the effect of winning public procurement tenders with additional environmental award criteria on firms’ introduction of environmental ...
In:
Research Policy
51 (2022), 6, 104516, 27 S.
| Bastian Krieger, Vera Zipperer