F = P \cdot (1+r)^t |
In other words it's equivalent to the interest rate in unit time which can be potentially returned on the initial investment of cash .
The word "discount" means that a cash flow today is more valuable than identical cash flow in future because a present cash can be invested immediately and begin earning returns at rate , while a future flow cannot.
The value of discount rate is set by the corporate investment policy but usually related to the market-determined Weighted Average Cost of Capital
[ Weighted Average Cost of Capital (WACC) ]