Economics
Discounted Cash Flow (DCF)
Quick fact
A DCF analysis can reveal that a company trading at a high stock price may actually be undervalued if its future cash flows are expected to grow rapidly—and vice versa.
Why this is interesting
Imagine you're offered $100 today or $100 a year from now. Most would take the money today—because money has time value. Discounted cash flow (DCF) is the method that quantifies that intuition.
Read the full explanation
Understanding Discounted Cash Flow (DCF)
At its heart, DCF is about comparing money received at different times. A dollar today can be invested to earn more, so future dollars are worth less. DCF works by first forecasting the cash flows an investment will generate (like annual profits or dividends). Then each future amount is 'discounted' using a discount rate—a percentage that reflects risk and opportunity cost. This converts all future amounts into today's dollars (present values). Adding them up gives the total present value. If that value exceeds the initial cost, the investment is worthwhile. For example, a project promising $110 in one year with a 10% discount rate is worth $100 today. If it costs $95, you'd invest.
A deeper explanation
The mechanism behind DCF is the time value of money, which rests on two principles: opportunity cost (money can earn returns elsewhere) and risk (future cash flows are uncertain). The discount rate is usually the weighted average cost of capital (WACC) for a company, representing the return required by investors. The formula for present value of a single cash flow is PV = CF / (1 + r)^t, where r is the discount rate and t is the number of periods. For a stream of cash flows, you sum each PV. Additionally, because most businesses have indefinite life, a terminal value is often estimated for cash flows beyond the forecast period—often using a perpetuity growth model. DCF is central to investment banking, equity research, and project evaluation because it forces explicit assumptions about future performance and risk. It reveals that an asset's true value comes from its ability to generate cash, not from market hype.