Definitions for "Positive externality"
the situation in which benefits spill over onto someone not involved in producing or consuming the good.
A beneficial externality; that is, a beneficial effect of one economic agent's actions on another. Considered a distortion because the first agent has inadequate incentive to act. Examples are the attractiveness of well-kept farms for the tourism industry (a production externality) and reduced contagion of disease due to vaccines (a consumption externality).
a benefit that goes beyond the individual to society at large