Externalities can create a threat to environmental quality

If the supplies of capital and labour are fixed and technology is unchanging, then real output is:

A. fixed. B. determined by demand. C. uncertain. D. subject to wide fluctuations.

Countries tend to export different goods and services because of:

a. differences in their comparative advantages. b. differences in tastes and technological needs. c. differences in income. d. similarities in resource endowment. e. differences in the exchange rates.