Avaliação das reações do Mercado de Capitais no Brasil e na Austrália após o acidente ambiental da Mineradora Samarco

Francisco Sávio Maurício Araújo, Rômulo Alves Soares, Mônica Cavalcanti Sá de Abreu

Resumo


O artigo analisa a reação do mercado de capitais após o acidente ambiental da mineradora Samarco. A Samarco se organiza como joint venture societária dividida igualmente entre a empresa brasileira Vale e a empresa anglo-australiana BHP Billiton. Foi adotada a técnica de estudo de eventos para calcular o risco sistemático (beta) e avaliar as variações no retorno das ações de empresas do setor de mineração dos mercados de capitais brasileiro e australiano. Os dados utilizados na pesquisa foram obtidos no BM&FBovespa para as empresas brasileiras e na Australian Securities Exchange (ASX) para as empresas australianas, ao longo do ano de 2015. Os resultados da pesquisa evidenciam que, no mercado brasileiro, apenas a empresa Vale apresentou um declínio significante do coeficiente beta. Em relação às empresas australianas houve declínio no risco sistemático para as empresas BHP Billiton, Rio Tinto e NCM. O rompimento da barragem de Fundão da mineradora Samarco entrou para o rol dos desastres ambiental globais. No entanto, os impactos econômicos, ambientais e sociais foram rapidamente absorvidos pelo mercado de capitais, e não influenciaram o valor das ações de empresas do setor de mineração no Brasil e na Austrália a longo prazo.

Palavras-chave


Teoria Institucional; Teoria dos Stakeholders; Análise de Evento; Setor de Mineração; Acidentes Ambientais.

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DOI: http://dx.doi.org/10.16930/2237-7662/rccc.v17n52.2659

Revista Catarinense da Ciência Contábil – CRCSC, Florianópolis, SC, Brasil. eISSN: 2237-7662, ISSN: 1808-3781


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