The 12-Uhr-Regel, introduced on April 1, 2026, to limit fuel price increases to once daily, has led to higher profit margins for German gas stations — particularly smaller ones — according to a study by the Leibniz-Zentrum für Europäische Wirtschaftsforschung and the Düsseldorfer Institut für Wettbewerbsökonomie.
In the two weeks following the rule’s implementation, the margin for a liter of Superbenzin rose by six cents compared to the two weeks prior, while diesel margins also increased, though researchers could not quantify the rise reliably due to volatile prices.
The gains were unevenly distributed: smaller chains and independent operators saw the largest increases, while major chains recorded the smallest.
Why smaller stations benefited more from the pricing rule
Researchers attribute the disparity to differing risk calculations across company sizes. Larger firms, wary of antitrust scrutiny, restrained their margin hikes despite the rule allowing only one daily price increase.
For more on this story, see 12-Uhr-Regel boosts fuel margins for small German stations, study finds 12-Uhr-Regel boosts fuel margins for small German stations, study finds.
As Justus Haucap, director of DICE, explained, larger companies “as market-dominant actors… must fear cartel investigations more,” which dampened their pricing behavior even under the latest framework.
What the findings reveal about market competition and regulation
The study underscores that the 12-Uhr-Regel did not produce uniform effects. Instead, its impact varied significantly by regional market structure and competitive intensity, suggesting that regulatory outcomes depend heavily on existing industry dynamics.
This uneven result challenges the policy’s stated goals of lowering prices and increasing transparency, as the intended consumer benefits may be offset by disproportionate gains for smaller players who face less competitive pressure.
Did the rule achieve its goal of lowering fuel prices?
The sources do not provide data on overall price levels for consumers after the rule’s introduction, only on profit margins. It cannot be determined from this study whether the 12-Uhr-Regel reduced fuel prices at the pump.
Could larger chains still benefit indirectly from the rule?
While larger chains showed smaller direct margin increases, the study does not rule out indirect benefits such as stabilized market conditions or reduced price volatility, though these effects were not measured or confirmed in the research.
