Economics
Net Present Value (NPV)
Quick fact
A positive NPV means an investment is expected to generate more value than its cost, after accounting for the time value of money—making it the gold standard for investment decisions.
Why this is interesting
Would you rather have $100 today or $110 a year from now? The answer isn't obvious—it depends on what that $100 could earn in the meantime. This puzzle lies at the heart of Net Present Value.
Read the full explanation
Understanding Net Present Value (NPV)
Net Present Value (NPV) builds on a simple idea: money today is worth more than the same amount in the future because you can invest it and earn returns. To compare future cash flows with an upfront cost, we 'discount' them back to the present using a discount rate (the rate of return you could earn elsewhere). You sum all discounted future cash flows, then subtract the initial investment. If the result is positive, the project is expected to add value; if negative, it destroys value.
A deeper explanation
NPV works because it respects the time value of money and considers all cash flows over the project's life. The discount rate reflects the riskiness of the cash flows and the opportunity cost of capital. By converting future amounts into today's terms, NPV allows direct comparison of different investments. It is widely used in corporate finance to decide whether to launch new projects, and in personal finance to evaluate retirement savings or real estate purchases. Unlike payback period, NPV accounts for the timing of cash flows, and unlike Internal Rate of Return, it avoids multiple or no solutions for unconventional cash flows.