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42 Chapter 3 - Interest Rates: Paying for RiskFigure 3.1 Percentage Components of Real Interest Rates 2004 – 05AfricaSouth AsiaEast Europe and Central AsiaBoliviaEcuadorColombiaEast Asia and PacificMiddle East and North AfricaPeruRemaining Latin American countriesAverageSource: Presentaon by Adrian González (2008).0 5 10 15 20 25 30operational costs financial costs loss profitFigure 3.1 also gives an indication of how capital costs contribute to interest rates, as calculated by measuringthe MFIs’ financial expenses against portfolio returns, 3 which were between 3 and 10 percent. The cost of capitaltypically includes weighted averages of the rates paid by the MFI on the loans or deposits used to finance itsportfolio, as well as the cost of equity. 4 Costs are adjusted for subsidized loans and grants. Self-sustaininginstitutions paying market rates will have higher financial costs.Sustainable interest rates also cover the <strong>risk</strong> that the loan will not be repaid. The <strong>risk</strong> price can be set on thebasis of the historical loan loss rate for the entire portfolio, or it can be estimated and priced for categories ofborrowers. The first method is a simple calculation based on the portion of the gross loan portfolio that must bewritten off due to borrower defaults every year. The MFIs analyzed in figure 3.1 averaged loan losses of about2 percent of their portfolios, which translates into roughly 2 percentage points in the interest rates that theinstitutions must charge borrowers, on average. 5More complex <strong>risk</strong>-pricing methodologies assess the probability of default at the client level and assignhigher interest rates to <strong>risk</strong>ier classes of borrowers. Using segmented <strong>risk</strong>-evaluation techniques, forexample, one can analyze groups of borrowers with similar characteristics to determine how thosecharacteristics correlate with loan performance. The data and analysis for this segmentation can be drawn froman MFI’s own database or, preferably, from a database that contains information from other MFIs, as well asbusinesses that are likely to have payment and transaction histories for lower-income borrowers (domesticgoods retailers, agricultural input suppliers, and mobile phone service providers). 63. Financial expenses as defined by Microfinance Information Exchange are the “total of financial expense on liabilities, net inflationadjustment, cost-of-funds adjustment and other expenses from financial services.” See González (2008).4. In theory, the cost of equity is the return shareholders require on the capital they invest in an enterprise. While MFIs rarely haveshareholders expecting dividends, Rosenberg (2002) recommends they calculate the expected erosion in the value of their equitycaused by inflation and add this component to the cost of capital.5. A 5 percent loan loss rate would translate into about 5.25 percent as a component of an interest rate calculated using this method, becauseMFIs must plan to earn enough interest on the loans that are repaid to cover the losses on the larger amount that is lent. See Rosenberg (2002).6. For more information about the development of credit reporting systems that include data relevant to lower-income borrowers, see theInternational Finance Corporation’s Credit Bureau Knowledge Guide, http://www.ifc.org/ifcext/gfm.nsf/Content/FinancialInfrastructure.

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