Example image of eyePlorer eyePlorer map for 'Penn effect': Economy Exchange rate Gross domestic product Income Econometrics Balassa–Samuelson effect Neoclassical economics Gold Purchasing power parity Consumer price index University of Pennsylvania World War II Paul Samuelson First World Third World Big Mac Switzerland Money Russia Law of one price Economic efficiency Zürich India List of subsistence techniques Ceteris paribus Tradable Standard of living Big Mac Index Price The Economist Japanese yen New York Tokyo United States dollar Bretton Woods system Central bank Floating exchange rate General equilibrium theory Cliometrics University of Houston List of effects