How is fiat money unlike commodity money? (a) fiat money is not used in the United States (b) fiat money is valuable only because government says it is (c) commodity money has no value other than as money (d) commodity money is the common form of money today

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The prebisch–singer hypothesis concludes that: a. technology lowers the cost of manufactured products, so developing countries should see an increase in their terms of trade. b. developing countries experience a long-run decline in their terms of trade, as the demand for primary products in higher-income countries declines relative to their demand for manufactured goods. c. because of unfair trading practices, labor in developing countries is exploited. d. opec has been responsible for a slowdown in the world's standard of living.