Big Four are countries that are part of the nations that provide what organization with funds to lend?
Big Four (Western Europe):  These countries are considered major European powers and they are the Western European countries individually represented as full members of the G7, the G8, G10 and the G20. Group of Ten (economics): The Group of Ten or G-10 refers to the group of countries that agreed to participate in the General Arrangements to Borrow (GAB), an agreement to provide the International Monetary Fund with additional funds to increase its lending ability.
International Monetary Fund