How does public goods generatate positive externalities?

Public goods generate positive externalities by providing benefits to individuals and communities that extend beyond the direct users of the good. For example, a well-maintained public park improves local air quality, increases property values, and promotes social interaction, benefiting even those who do not visit the park. These spillover effects can enhance overall societal well-being and encourage communal investment in such goods. As a result, public goods often require government intervention to ensure they are adequately funded and maintained, as the private market may underprovide them due to their non-excludable and non-rivalrous nature.