What are some of the different types of barriers to entry that give rise to monopoly power? give an example of each.
the most common types of barriers to entry are
a. exclusive rights, such as copyrights, patents, and licenses, and the availability of close substitutes, which can increase the price elasticity of demand.
b. environmental regulations, where production requires permits, and economies of scale, which can result in natural monopolies.
c. environmental regulations, where production requires permits, and exclusive rights, such as copyrights, patents, and licenses.
d. exclusive rights, such as copyrights, patents, and licenses, and economies of scale, which can result in natural monopolies.
e. exclusive rights, which can result in natural monopolies, and economies of scale, such as copyrights, patents, and licenses.

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.

Consider the following information on stocks a, b, c and their returns (in decimals) in each state: state prob. of state a b c boom 20% 0.27 0.22 0.16 good 45% 0.16 0.09 0.07 poor 25% 0.03 0 0.03 bust 10% -0.08 -0.04 -0.02 if your portfolio is invested 25% in a, 40% in b, and 35% in c, what is the standard deviation of the portfolio in percent? answer to two decimals, carry intermediate calcs. to at least four decimals.

John's pizzeria and equilibrium john is selling his pizza for $6 per slice in an area of high demand. however, customers are not buying his pizza. using what you learned about the principles of equilibrium, write three to four sentences about how john could solve his problem.