3.1. Criteria for financial viability
A zero net present value means the project repays original investment
plus the required rate of return. A positive net present
value means a better return, and a negative net present value
means a worse return, than the return from zero net present value.
It is one of the two discounted cash flow techniques (the other is
internal rate of return) used in comparative appraisal of investment
proposals where the flow of income varies over time [16,17].