Economic efficiency requires that goods be allocated to those who value them the most. Since Jamil values the boots at Rs100 and Saleem at Rs40, Jamil derives higher utility from the item. Allocating the boots to Jamil ensures that the resource is used where it generates the highest possible value, thereby maximizing the total economic benefit within the system.

Social welfare is maximized when the marginal social benefit (MSB) of an activity equals its marginal social cost (MSC). At this point, the last unit of production provides exactly as much benefit to society as it costs to produce, ensuring that resources are allocated efficiently and no further net gain can be achieved by changing the output level.

In the absence of market failures such as externalities, public goods, or information asymmetry, competitive markets achieve Pareto efficiency. Rational agents ensure that resources are allocated to their highest-valued uses, which maximizes the sum of consumer and producer surplus, representing the most efficient possible outcome for the economy.

Inefficient allocation of resources occurs when the marginal cost of production deviates from the marginal benefit to society. In a perfectly efficient market, resources are allocated such that the marginal cost equals the marginal benefit. When these values diverge, it indicates that society could be better off by reallocating resources toward or away from the production of a specific good to maximize overall welfare.

An efficient market achieves three main goals: it ensures goods are produced by the lowest-cost sellers, it allocates those goods to the buyers who value them the most, and it produces the quantity that maximizes the total surplus (the sum of consumer and producer surplus). When these conditions are met, there is no deadweight loss, and the market is considered Pareto efficient.

Marginal Social Cost (MSC) represents the total cost to society of producing an additional unit of output. It is calculated as the sum of the Marginal Private Cost (MPC), which is the cost borne directly by the producer, and the Marginal External Cost (MEC), which represents the costs imposed on third parties. Understanding MSC is crucial for analyzing market failures and determining optimal levels of production.

Moral hazard occurs when an individual changes their behavior to be more risky after becoming insured, because they no longer bear the full cost of that risk. By smoking in bed after purchasing fire insurance, Gull is engaging in riskier behavior than he would have without the policy, as the insurance company now bears the financial burden of a potential fire, which is a classic example of moral hazard.

The Coase theorem relies on the assumption of zero transaction costs. If the costs of negotiating, drafting, and enforcing a contract are negligible, private parties can bargain to internalize externalities and achieve a Pareto-efficient outcome. If transaction costs are high, the parties may be unable to reach an agreement, even if a mutually beneficial solution exists.

Education generates positive externalities, meaning the social benefit exceeds the private benefit. When alumni donate to lower tuition, they are subsidizing the consumption of education to encourage more students to enroll. This action helps align the private market outcome with the socially optimal level of education, effectively internalizing the positive spillover effects that benefit society at large.

Externalities arise when the actions of an individual or firm impose costs or provide benefits to third parties that are not reflected in the market price. The divergence between private costs (or benefits) and social costs (or benefits) means that the market equilibrium does not account for the full impact of the activity on society, leading to inefficient outcomes.