Which of the following is a benefit of free trade? a. it reduces employment in many fields. b. it makes more diverse products available. c. it causes industries to decline. d. it makes countries dependent on foreign powers.

Which statement is a good description of a model? a) models are a description of nature based only on one or two variables. b) models are testable ideas but they are not very to most people. c) models are a description of nature that predicts more accurately than real events. d) models are an approximiation of a real system that omits all but most essential variables in a system.