Environmental Externality: A consequence of an industrial or commercial activity that affects other parties without this being reflected in market prices, such as the pollution of a river by a factory.
Pigouvian Tax: A tax imposed on a market activity that generates negative externalities, such as pollution, in order to correct the market failure and restore the socially optimal level of output.
Extended Producer Responsibility (EPR): A policy approach under which producers are given a significant responsibility, financial and/or physical, for the treatment or disposal of post-consumer products.