3. Typologies of PDBs and DFIs In this section, we will identify analytical dimensions to classify PDBs and DFIs into different categories to reveal their vast diversity. Applying the five qualification criteria in Section III, we have identified 527 PDBs and DFIs worldwide in total. Many criteria can be used to classify banks and financial institutions—as a biologist would do for plants or animals—to organize a typology. To start with, we focus on basic analytical dimensions, namely, ownership structure (who owns them), geographical operation (where they operate), asset size (how big their total assets are), official mandate (what they aim to do), and income levels of their home countries (for national PDBs and DFIs, which income level their home country belongs to). To arrive at a coherent set of institutions, we would need more than one analytical dimension to make the classification. Figure 2 presents the typologies used to classify the PDBs and DFIs. Figure 2. The variety of typologies of PDBs and DFIs
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