Which of the following are examples of Pareto-efficient changes? Explain your answers.

a. Cindy trades her laptop computer to Bob for his old car.
b. Competition is introduced into the electric industry, and electricity rates drop. A study shows that benefits to consumers are larger than the lost monopoly profits.
c. A high tax on wool sweaters deters buyers. The tax is repealed.
d. A federal government agency is reformed, and costs are cut 23 percent with no loss of service quality.

a. Cindy trades her laptop computer to Bob for his old car: This example is not necessarily a Pareto-efficient change because it does not specify the preferences or utility of Cindy and Bob. If both Cindy and Bob value the laptop and car equally, then the trade might be Pareto-efficient. However, if one party values the laptop or car much more than the other, then the trade would not be Pareto-efficient because one party would benefit more than the other.

b. Competition is introduced into the electric industry, and electricity rates drop. A study shows that benefits to consumers are larger than the lost monopoly profits: This example is a Pareto-efficient change because it results in a win-win situation. The introduction of competition leads to lower electricity rates, benefitting consumers. Although the monopoly profits are lost, the overall benefit to society outweighs the loss, making it Pareto-efficient.

c. A high tax on wool sweaters deters buyers. The tax is repealed: This example is a Pareto-efficient change because the tax repeal removes a barrier that had a negative impact on buyers. By repealing the tax, buyers have the freedom to purchase wool sweaters without the burden of the tax, resulting in a more efficient allocation of resources.

d. A federal government agency is reformed, and costs are cut 23 percent with no loss of service quality: This example is a Pareto-efficient change because it achieves cost savings without compromising the quality of services provided by the agency. By reducing costs while maintaining service quality, resources can be allocated more efficiently, benefiting both the government and its constituents.

To determine which of the given options are examples of Pareto-efficient changes, we need to understand what Pareto efficiency means.

Pareto efficiency, also known as Pareto optimality, is a concept in economics that represents a situation where it is not possible to make someone better off without making someone else worse off. In other words, a change or an outcome is Pareto efficient when no further changes can be made to improve someone's situation without negatively impacting someone else.

Now, let's analyze each option:

a. Cindy trades her laptop computer to Bob for his old car.
In this case, both Cindy and Bob agree to the trade voluntarily. If both parties perceive the trade as beneficial and willingly exchange their goods without coercion or deception, it can be considered a Pareto-efficient change. Both individuals have improved their situations without worsening the other's position.

b. Competition is introduced into the electric industry, and electricity rates drop. A study shows that benefits to consumers are larger than the lost monopoly profits.
Here, the introduction of competition leads to a decrease in electricity rates, benefiting the consumers. Since consumers are better off without adversely affecting any other party, this change is Pareto efficient.

c. A high tax on wool sweaters deters buyers. The tax is repealed.
In this scenario, the high tax on wool sweaters discourages buyers and restricts market activity. When the tax is repealed, it removes an economic barrier and enables buyers to purchase sweaters freely. This change benefits buyers without negatively impacting other parties, making it a Pareto-efficient change.

d. A federal government agency is reformed, and costs are cut 23 percent with no loss of service quality.
If a federal government agency can successfully reduce costs by 23 percent without compromising the quality of service provided, it implies a more efficient utilization of resources. This change is Pareto efficient as it allows cost reduction without negatively affecting the services provided, which benefits taxpayers and the government simultaneously.

To summarize, options b, c, and d are examples of Pareto-efficient changes. These changes result in improved outcomes for one or more parties without impairing the well-being of others.