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Estimating the overcharge of the liquefied petroleum gas cartel in Brazil’s Federal District:: evidence from Before-and-After and Difference-in-Differences approaches. RDC [Internet]. 10º de dezembro de 2025 [citado 16º de fevereiro de 2026];13(2):140-59. Disponível em: https://revista.cade.gov.br/index.php/revistadedefesadaconcorrencia/article/view/1955