What is the intuition of discounting the several cash flows in the APV model at fixed discount rates?
The APV model is a value-additivity method where total value is defined by the sum of the present values of the individual cash outflows and inflows. Every cash flow will not necessarily have similar amount of risk associated with it. To account for risk variations in the analysis, every cash flow is discounted at a rate commensurate along with the inherent riskiness of the cash flow.