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The World Bank logo with blue globe icon and text “THE WORLD BANK” and “IBRD • IDA”

In order to reflect the international nature of our organization’s mission and membership, AED uses a tiered dues structure with fees based the World Bank's world development indicators.

Zone One is made up of high-income countries, Zone Two of upper-middle income countries, and Zone Three of lower-middle income and low-income countries, as defined by the World Bank.