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How to quantify the influence of correlations on investment diversification

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  • Matus Medo
  • Chi Ho Yeung
  • Yi-Cheng Zhang

Abstract

When assets are correlated, benefits of investment diversification are reduced. To measure the influence of correlations on investment performance, a new quantity - the effective portfolio size - is proposed and investigated in both artificial and real situations. We show that in most cases, the effective portfolio size is much smaller than the actual number of assets in the portfolio and that it lowers even further during financial crises.

Suggested Citation

  • Matus Medo & Chi Ho Yeung & Yi-Cheng Zhang, 2008. "How to quantify the influence of correlations on investment diversification," Papers 0805.3397, arXiv.org, revised Feb 2009.
    • Handle: RePEc:arx:papers:0805.3397
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    References listed on IDEAS

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    Cited by:

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    2. Paolo Laureti & Matus Medo & Yi-Cheng Zhang, 2010. "Analysis of Kelly-optimal portfolios," Quantitative Finance, Taylor & Francis Journals, vol. 10(7), pages 689-697.
    3. Xi Zhang & Xu Wu & Linlin Zhang & Zhonglu Chen, 2022. "The Evaluation of Mean-Detrended Cross-Correlation Analysis Portfolio Strategy for Multiple risk Assets," Evaluation Review, , vol. 46(2), pages 138-164, April.
    4. Luo Yong & Zhu Bo & Tang Yong, 2015. "Dynamic optimal capital growth of diversified investment," Journal of Applied Statistics, Taylor & Francis Journals, vol. 42(3), pages 577-588, March.
    5. Charfeddine, Lanouar & Najah, Ahlem & Teulon, Frédéric, 2016. "Socially responsible investing and Islamic funds: New perspectives for portfolio allocation," Research in International Business and Finance, Elsevier, vol. 36(C), pages 351-361.
    6. Migliavacca, Milena & Goodell, John W. & Paltrinieri, Andrea, 2023. "A bibliometric review of portfolio diversification literature," International Review of Financial Analysis, Elsevier, vol. 90(C).
    7. He, Jinfu & Liu, Yu, 2024. "Digital inclusion finance, social governance and household investment decisions," Finance Research Letters, Elsevier, vol. 62(PB).
    8. Florin Aliu & Besnik Krasniqi & Adriana Knapkova & Fisnik Aliu, 2019. "Interdependence and Risk Comparison of Slovak, Hungarian and Polish Stock Markets: Policy and Managerial Implications," Acta Oeconomica, Akadémiai Kiadó, Hungary, vol. 69(2), pages 273-287, June.
    9. ALIU Florin & NUHIU Artor & KNAPKOVA Adriana & LUBISHTANI Ermal & TRAN Khang, 2021. "Do Cryptocurrencies Offer Diversification Benefits For Equity Portfolios?," Studies in Business and Economics, Lucian Blaga University of Sibiu, Faculty of Economic Sciences, vol. 16(2), pages 5-18, August.

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