Which of the following was signed in 1987 and banned the exportation and importation of chlorofluorocarbon compounds (CFCs) and halons?

Over the last three decades in the United States, services have become a smaller fraction of GDP relative to goods

Indicate whether the statement is true or false

A market with easy entry could include

A) perfect competition. B) monopolistic competition. C) an oligopoly. D) a. and b. are possible