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3. Friedman, M., & Roosa, R. V. (1967). The Balance of Payments: Free Versus Fixed Exchange Rates. Washington: American Enterprise Institute for Public Policy Research.
4. Johnson, H. G. (1970). The case for flexible exchange rates, 1969. London: Institute for Economic Affairs.
5. Macdonald, R. (2007). Exchange Rate Economics: Theories and Evidence. London: Routledge.