Suppose a political candidate criticizes a government pollution permit policy that she says lets corporations buy and sell the right to pollute. She argues that our right to breathe and the future of our planet require real regulation instead of this type of government policy. Which of the following describes why most economists would disagree with her statement?

a. Clean air is a fundamental right, and government regulation will allow too much pollution.
b. A free market in tradable pollution permits is typically more efficient than government regulation.
c. The environment is so important that it should be protected as much as possible, regardless of the cost.
d. A corrective tax would result in a more efficient outcome than either tradable permits or government regulation would.

Alarge university wanted to study the relationship between completing an internship during college and students' future earning potential. prom the same graduating class, they selected a random sample of 80 students who completed an internship and 100 students who did not complete an internship and examined their salaries five years after graduation. they found that there was a statistically higher mean salary for the internship group than for the noninternship group. which of the following interpretations is the most appropriate? a. there could be a confounding variable, such as student major, that explains the difference in mean salary between the internship and no internship groups.b. we cannot infer anything from these data since the distribution of salaries is likely right skewed.c. you cannot draw any valid conclusions because the sample sizes are different.d. more students should complete internships because having an internship produces a higher salary.