Cash Flow — Financial input. Directly drives affordability, yield, or cost; small changes compound over time. Example: 0.1.
Cash Flow is required
Discount Rate — Rate as a percentage. Determines how quickly interest or growth accrues; even 0.5% changes matter over time. Example: 0.101.
Discount Rate is required
Calculate perpetuity present value
Formula
presentValue = cashFlow ÷ discountRate