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On the Estimation Stability of Efficiency and Economies of Scale in Microfinance Institutions

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Abstract

This paper uses a panel data set of microfinance institutions (MFI) across the world to compare several identification strategies of cost efficiency and economies of scale. Concretely, we contrast the non-parametric Data Envelopment Analysis (DEA) with the Stochastic Frontier Analysis (SFA) and a distribution-free identification based on timeinvariant heterogeneity estimates. Furthermore, we analyze differences of production functions across regions and investigate the relevance of accounting for unobserved heterogeneity across countries. The results suggest that efficiency rankings of MFIs are robust across identification strategies, but highlight the relevance of accounting for unobserved heterogeneity. We further find substantial economies of scale for a pure financial production process. However, accounting for the multi-dimensional production process of MFIs by including a measure of outreach lowers the estimated extent of economies of scale for the parametric estimations, suggesting that producing outreach creates high transaction costs and requires exploitation of local knowledge.

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Bibliographic Info

Paper provided by KOF Swiss Economic Institute, ETH Zurich in its series KOF Working papers with number 01-296.

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Length: 21 pages
Date of creation: Jan 2012
Date of revision:
Handle: RePEc:kof:wpskof:01-296

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Keywords: microfinance; cost efficiency; economies of scale; SFA; DEA; DFA; unobserved heterogeneity; outreach;

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