Main component organization of the World Bank .
The IBRD lends money to middle-income and creditworthy poorer countries. Most of its funds come from sales of bonds in international capital markets. More than 180 countries are members of the IBRD. Each member's voting power is linked to its capital subscription; the U.S., with some one-sixth of the shares in the IBRD, has veto power over any proposed changes to the bank. See also International Monetary Fund ; United Nations Development Programme.