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Property rights are the legal rights to use, control, and dispose of assets or resources. They can be allocated to individuals, groups, or the government, and they help determine how resources are used in an economy. #Step 2: Define external costs#

External costs, also known as negative externalities, are the costs that affect people or entities who are not involved in the production or consumption of a good or service. These costs are not reflected in market prices and can lead to market failures, because the producers and consumers do not bear the full cost of their actions. #Step 3: Explain better-defined property rights#

Better-defined property rights are clear and enforceable rights to use, control, and dispose of resources. They reduce ambiguity regarding ownership and prevent issues like the tragedy of the commons, where resources are overused because no one has exclusive rights to them. Well-defined property rights enable easier transactions and monitoring of resource use since it is clear who has the authority to allocate or trade resources. #Step 4: Describe the incentive provided by better-defined property rights for accounting external costs#

Better-defined property rights create an incentive for individuals, businesses, or governments to account for external costs. When property rights are clear and enforceable, owners have the motivation to manage and protect their resources because they can capture the benefits and/or bear the costs of their management decisions. If an activity generates negative externalities, the property owner responsible for those externalities might be held accountable for the costs, for example through fines or lawsuits. This accountability incentivizes property owners to internalize the external costs, by either reducing the negative impact of their activities or compensating those affected by it. Furthermore, better-defined property rights may also lead to the development of markets for trading rights, such as pollution permits or carbon credits. Such markets allow property owners to make more efficient decisions about resource use, and they encourage those who can reduce external costs at a lower cost to do so, which is beneficial for society overall. To summarize:

Define Property rights: legal rights to use, control, and dispose of assets or resources.

Define External costs: costs that affect people or entities who are not involved in the production or consumption of a good or service.

Explain better-defined property rights: clear and enforceable rights to use, control, and dispose of resources, enabling easier transactions and monitoring.

Describe the incentive provided by better-defined property rights: motivation to manage and protect resources, hold property owners accountable for external costs, and enable the development of markets for trading rights.