Demand

The need, ability, and willingness to pay for a commodity.

Developmental Evaluation

“supports innovation development to guide adaptation to emergent and dynamic realities in complex environments”

Michael Quinn Patton – http://betterevaluation.org/plan/approach/developmental_evaluation

Discounting

The mathematical procedure for adjusting future costs and outcomes of health‐care interventions to “present value”; this adjusts for differences in the timing of cost (expenditure) compared to health benefits (outcomes).