The following diagram shows one indifference curve representing the preferences for goods X and Y for one consumer. 
What is the marginal rate of substitution between points A and B?
Definitions:
Federal Government
A system of government where powers and responsibilities are divided between a national government and smaller administrative regions, states or provinces.
Pentagon Papers
Classified United States government documents regarding the political-military involvement of the United States in Vietnam from 1945 to 1971, which were leaked to the public in 1971.
Vietnam War
A prolonged conflict (1955-1975) between the communist forces of North Vietnam, supported by its allies, and the government of South Vietnam, supported by the United States and other anti-communist nations.
American Leaders
Individuals who have held significant leadership roles in the political, military, or social spheres of the United States.
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