work is licensed under a Creative Commons IGO 3.0 AttributionNonCommercial-NoDerivatives (CC-IGO BY-NC-ND 3.0 IGO) license (http://creativecommons.org/licenses/by-nc-nd/3.0/igo/ legalcode) and may be reproduced with attribution to the IDB and for any non-commercial purpose, as provided below. No derivative work is allowed.Any dispute related to the use of the works of the IDB that cannot be settled amicably shall be submitted to arbitration pursuant to the UNCITRAL rules. The use of the IDB's name for any purpose other than for attribution, and the use of IDB's logo shall be subject to a separate written license agreement between the IDB and the user and is not authorized as part of this CC-IGO license.Following a peer review process, and with previous written consent by the Inter-American Development Bank (IDB), a revised version of this work may also be reproduced in any academic journal, including those indexed by the American Economic Association's EconLit, provided that the IDB is credited and that the author(s) receive no income from the publication. Therefore, the restriction to receive income from such publication shall only extend to the publication's author(s). With regard to such restriction, in case of any inconsistency between the Creative Commons IGO 3.0 Attribution-NonCommercial-NoDerivatives license and these statements, the latter shall prevail.Note that link provided above includes additional terms and conditions of the license. This paper analyzes influences on the credit standing of Multilateral Development Banks (MDBs). We focus on the quality, diversification and single name concentration of their portfolios, and on the market practice known as Preferred Creditor Status (PCS). PCS refers to the fact that sovereigns which default on other debt rarely fail to meet their obligations to MDBs. The paper examines how rating agencies assess MDB ratings, looking, in particular, at how Standard & Poor's (S&P) evaluates capital adequacy. We benchmark the agency's approach against an industry-standard, ratings-based Credit Risk Model (CRM). We implement the approaches for a specific MDB: the Inter-American Development Bank (IDB).The paper shows that S&P's approach is highly conservative in its treatment of single name concentration risk and makes insufficient allowance for PCS. Calibrating the CRM with risk-neutral distributions, we examine the effect of PCS on MDB funding spreads.
Executive SummaryMultilateral Development Banks (MDBs) play an important role in international financial markets, raising money by issuing bonds and lending to their borrowing member countries.In so doing, they benefit from a market practice known as Preferred Creditor Status (PCS). PCS refers to the fact that sovereign borrowers typically continue to service their loans from MDBs even in the unlikely event that they default on other claims. This confers on the loans of MDBs a type of de facto seniority.The business model followed by MDBs requires that they maintain a high credit standing.For this reason, their assessment ...