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Sparse and Stable International Portfolio Optimization and Currency Risk Management

Author

Listed:
  • Raphael Burkhardt

    (University of Zurich - Department of Banking and Finance)

  • Urban Ulrych

    (University of Zurich - Department of Banking and Finance; Swiss Finance Institute)

Abstract

This paper introduces a sparse and stable optimization approach for a multi-currency asset allocation problem. We study the benefits of joint optimization of assets and currencies as opposed to the standard industry practice of managing currency risk via so-called currency overlay strategies. In our setting, a classical mean-variance problem in an international framework is augmented by several extensions that aim at reducing parameter uncertainty related to the input parameters and induce sparsity and stability of the asset and currency weights. These extensions integrate maximal net exposure to foreign currencies, shrinkage of the input parameters, and constraints on the norms of the asset- and currency-weight vectors. The empirical performance of the portfolio optimization strategies based on the proposed regularization techniques and the joint (i.e., asset and currency) optimization is tested out of sample. We demonstrate that the sparse and stable joint optimization approach consistently outperforms the standard currency overlay as well as the equally-weighted and the non-regularized global portfolio benchmarks net of transaction costs. This result shows that the common industry practice of employing currency overlay strategies is suboptimal and can be improved by a joint optimization over assets and currencies.

Suggested Citation

  • Raphael Burkhardt & Urban Ulrych, 2022. "Sparse and Stable International Portfolio Optimization and Currency Risk Management," Swiss Finance Institute Research Paper Series 22-07, Swiss Finance Institute.
  • Handle: RePEc:chf:rpseri:rp2207
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    More about this item

    Keywords

    International Asset Allocation; Currency Risk Management; Currency Overlay; Shrinkage Estimation; Regularization; Mean-Variance Optimization;
    All these keywords.

    JEL classification:

    • C61 - Mathematical and Quantitative Methods - - Mathematical Methods; Programming Models; Mathematical and Simulation Modeling - - - Optimization Techniques; Programming Models; Dynamic Analysis
    • F31 - International Economics - - International Finance - - - Foreign Exchange
    • G11 - Financial Economics - - General Financial Markets - - - Portfolio Choice; Investment Decisions
    • G15 - Financial Economics - - General Financial Markets - - - International Financial Markets

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