Capital Flows

43 Pages Posted: 30 Nov 2001

See all articles by Ayse Imrohoroglu

Ayse Imrohoroglu

University of Southern California - Marshall School of Business

Krishna B. Kumar

University of Southern California

Date Written: September 2001


In this paper, we reexamine the question "Why doesn't capital flow from rich to poor countries?" posed by Lucas (1990). Our findings suggest that even if capital flows freely it will flow to middle income countries rather than to poor countries. We start with the stylized fact that poorer countries have high intermediation costs, and develop a simple disaggregation of the neoclassical production function based on a model of costly intermediation of funds between safe and risky projects when there is ex ante heterogeneity of project potential. When intermediation costs are ignored, the model behaves much like the neoclassical model in terms of capital returns. However, when intermediation costs are considered, the return for a given amount of capital can be non-monotonic in costs. Therefore, the combination of capital and cost differences across countries gives rise to a rich variation of returns, one that suggests a tendency for capital to flow to middle income countries, as seen in data. Indeed, when we embed the static return function in a two-country dynamic model, there is capital outflow from a poor country that removes capital controls and becomes open. We find that even though the closed economy dominates in terms of capital employed in production, it is the open economy that dominates in terms of income, consumption and welfare.

Suggested Citation

Imrohoroglu, Ayse and Kumar, Krishna B., Capital Flows (September 2001). Available at SSRN: or

Ayse Imrohoroglu (Contact Author)

University of Southern California - Marshall School of Business ( email )

701 Exposition Blvd
Los Angeles, CA California 90089
United States
213-740-6518 (Phone)
213-740-6650 (Fax)

Krishna B. Kumar

University of Southern California ( email )

Marshall School of Business, HOH 701
Los Angeles, CA 90089
United States
213-740-6533 (Phone)
213-740-6650 (Fax)

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