If the margin of safety is 0, then a. the company is precisely breaking even. b. the company is operating at a loss. c. the company is earning a small profit. d. the margin of safety cannot be less than or equal to 0; it must be positive. e. None of these choices are true.

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.