Portfolio Diversification, Proximity Investment and City Agglomeration

47 Pages Posted: 8 Mar 2005

See all articles by Massimo Massa

Massimo Massa

INSEAD - Finance

William N. Goetzmann

Yale School of Management - International Center for Finance; National Bureau of Economic Research (NBER)

Andrei Simonov

Michigan State University - Eli Broad Graduate School of Management; Russian Presidential Academy of National Economy and Public Administration (RANEPA); Centre for Economic Policy Research (CEPR)

Date Written: December 2004

Abstract

We study the puzzle of portfolio underdiversification and proximity investment from a novel perspective, linking it to the process of urbanization. We find that urban portfolios are more focused - i.e., less diversified and more concentrated in 'close' stocks. We explain it in terms of the process of 'professional specialization' that characterizes urban environments. We test this against a number of alternative theories: financial sophistication, social competition and hedging non-financial risk. We show that the very same factors behind the drive to city agglomeration also affect both the degree of portfolio diversification and proximity investing by influencing investor information and risk.

Keywords: Portfolio choice, under-diversification, proximity investment, professional specialization, city agglomeration

JEL Classification: G11, G14

Suggested Citation

Massa, Massimo and Goetzmann, William N. and Simonov, Andrei, Portfolio Diversification, Proximity Investment and City Agglomeration (December 2004). CEPR Discussion Paper No. 4786. Available at SSRN: https://ssrn.com/abstract=667961

Massimo Massa

INSEAD - Finance ( email )

Boulevard de Constance
F-77305 Fontainebleau Cedex
France
+33 1 6072 4481 (Phone)
+33 1 6072 4045 (Fax)

William N. Goetzmann (Contact Author)

Yale School of Management - International Center for Finance ( email )

165 Whitney Ave.
P.O. Box 208200
New Haven, CT 06520-8200
United States
203-432-5950 (Phone)
203-436-9252 (Fax)

HOME PAGE: http://viking.som.yale.edu

National Bureau of Economic Research (NBER)

1050 Massachusetts Avenue
Cambridge, MA 02138
United States

Andrei Simonov

Michigan State University - Eli Broad Graduate School of Management ( email )

645 N. Shaw Lane, 321 Eppley Center
East Lansing, MI 48824-1122
United States

HOME PAGE: http://www.andreisimonov.com

Russian Presidential Academy of National Economy and Public Administration (RANEPA) ( email )

Vernadskogo Prospect 82
Moscow, 119571
Russia

Centre for Economic Policy Research (CEPR) ( email )

London
United Kingdom

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