Understanding Externalities: Costs and Benefits Beyond Market Transactions

An externality is a cost or benefit experienced by individuals not directly involved in a market transaction, meaning it typically goes unreflected in market prices. These can be either positive or negative effects, often referred to as third-party effects, spillovers, or unintended side effects. Recognizing externalities is essential for assessing the full impact of economic activities on society and the environment, promoting better decision-making and policy interventions to mitigate adverse effects.