Based on your reading of open systems and “substitutes and complements” in the text, do you agree with marc or disagree? why?

Who collects federal taxes? a. irs b. ins c. treasury d. federal reserve

Rats that received electric shocks were unlikely to develop ulcers if the

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.