Classification of Externality
Keeping in view the nature of the problem, externality may be classified into four broad types:
The disposal of public bad under normal course is done in various forms through natural resources media like air, water and land by treating earth as a natural sink. In the process of disposal, if the pollution load of public bad exceeds the assimilative capacity of the natural resource, it will impose serious problem by impairing the ecological balance. Hence, the main issue is how to abate pollution to the required level in order to keep both living and non-living organisms in good health and prosperity.