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Immunization of Fixed-Income Portfolios Using an Exponential Parametric Model

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  • Almeida, Caio
  • Lund, Bruno

Abstract

Litterman e Scheinkman (1991) mostram que mesmo uma carteira de renda fixa duration imunizada (neutra) pode sofrer grandes perdas e, portanto, propõem fazer hedge de carteiras utilizando a análise de componentes principais. O problema é que tal abordagem só é possível quando as taxas de juros são observáveis. Assim, quando as taxas de juros não são observáveis, como é o caso da maior parte dos mercados de dívida externa e interna de diversos países emergentes, o método não é diretamente aplicável. Este artigo propõe uma abordagem alternativa que é realizar o hedge baseado nos fatores de um modelo paramétrico da estrutura a termo. A imunização seguindo esta abordagem não só se mostra simples como também equivalente ao procedimento proposto por Litterman e Scheinkman quando as taxas são observáveis. Exemplos do método para operações de hedge e alavancagem nos mercados de títulos de dívida pública brasileira indexada a inflação são apresentados. O trabalho ainda discute como montar a apreçar carteiras que replicam fatores de risco, o que permite extrair alguma informação sobre a expectativa dos agentes acerca do comportamento futuro da curva de juros.

Suggested Citation

  • Almeida, Caio & Lund, Bruno, 2014. "Immunization of Fixed-Income Portfolios Using an Exponential Parametric Model," Brazilian Review of Econometrics, Sociedade Brasileira de Econometria - SBE, vol. 34(2), November.
  • Handle: RePEc:sbe:breart:v:34:y:2014:i:2:a:18432
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    References listed on IDEAS

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