Economic analysis to assess societal benefits and costs associated with the activity. The economic costs of an intervention are not the same as its financial costs, in part because the economic costs also consider externalities. Externalities (positive or negative) are economic impacts that affect persons who are not necessarily part of the intervention scope. The financial (monetary) revenue of an intervention is usually a lower-bound estimate of its economic benefits; however, societal economic benefits can be much higher than monetary revenues.