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EnglishThis article aims to debate the abusive practices against consumers, with focus on the subsection X of the article 39 from the Consumer Defense Code that prohibits unjusti-fied price rises. The subject is analyzed from the basicstructure of the theory of abuse of right and the subsystem of abuse of right that exists in the consumer law, combined with the study of judicial decisions that tackles this thematic. The conclusion is that the state intervention in the economy is valid to guarantee harmony in the consumerist relationships, even when it regards to contest unjustified price rises over the absolute liberty given to the supplier that could create big social injustices according to the criteria fixed in this article portuguesO presente artigo tem por objetivo debater as praticas abusivas ao consumidor, com enfoque no inciso X do art. 39 do Codigo de Defesa do Consumidor que veda a elevacao de precos sem justa causa. O tema e analisado a partir da compreensao das bases da teoria do abuso de direito e do subsistema do abuso de direito presente na norma consumerista, aliada ao estudo de decisoes judiciais que abordaram a tematica. Conclui-se que a intervencao do Estado e valida para garantir a harmonia nas relacoes de consumo, inclusive quanto ao combate do aumento injustificado de precos em detrimento de uma liberdade absoluta ao fornecedor que ensejaria grandes injusticas sociais a partir dos criterios assentados neste artigo.

A ELEVAÇÃO INJUSTIFICADA DE PREÇOS COMO PRÁTICA ABUSIVA: FUNDAMENTAÇÃO E CRITÉRIOS PARA SUA IDENTIFICAÇÃO