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Portfolio size and the reduction of dispersion: the case of the United Kingdom commercial real estate market

Byrne, P. and Lee, S., (1999) Portfolio size and the reduction of dispersion: the case of the United Kingdom commercial real estate market. Working Papers in Land Management & Development. 04/99. Working Paper. University of Reading, Reading. pp27.

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This paper investigates the potential benefits and limitations of equal and value-weighted diversification using as the example the UK institutional property market. To achieve this it uses the largest sample (392) of actual property returns that is currently available, over the period 1981 to 1996. To evaluate these issues two approaches are adopted; first, an analysis of the correlations within the sectors and regions and secondly simulations of property portfolios of increasing size constructed both naively and with value-weighting. Using these methods it is shown that the extent of possible risk reduction is limited because of the high positive correlations between assets in any portfolio, even when naively diversified. It is also shown that portfolios exhibit high levels of variability around the average risk, suggesting that previous work seriously understates the number of properties needed to achieve a satisfactory level of diversification. The results have implications for the development and maintenance of a property portfolio because they indicate that the achievable level of risk reduction depends upon the availability of assets, the weighting system used and the investor’s risk tolerance.

Item Type:Report (Working Paper)
Divisions:Henley Business School > Real Estate and Planning
ID Code:27242
Publisher:University of Reading
Publisher Statement:The copyright of each working paper remains with the author. If you wish to quote from or cite any paper please contact the appropriate author; in some cases a more recent version of the paper may have been published elsewhere.


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