What is the Expected Value of Perfect Information (EVPI)?

What is the Expected Value of Perfect Information (EVPI)?

• A. The maximum amount a decision-maker would pay for perfect information about the future; EVPI = EV with perfect information − EV with current information
• B. The difference between the best and worst payoff
• C. The expected value of imperfect information
• D. The present value of future profits

Answer: (A)

EVPI measures how much a decision-maker would pay for perfect foresight about the future. It’s the difference between the value you’d obtain if you could act with perfect information and the value you get with your current information and decision rules. Expressed as EVPI = EV with perfect information − EV with current information, it represents the maximum premium you’d be willing to pay today to eliminate all uncertainty about the future. This concept captures the value of removing uncertainty: if knowing the exact future state would change your optimal choice and lead to a higher expected payoff, EVPI is that incremental value. The other ideas don’t fit because they describe different notions: the difference between the best and worst payoff is simply the range of outcomes, not the value of information; the expected value of imperfect information pertains to partial or noisy information, not perfect information; and the present value of future profits is about cash flow valuation (NPV), not about information value.

EVPI measures how much a decision-maker would pay for perfect foresight about the future. It’s the difference between the value you’d obtain if you could act with perfect information and the value you get with your current information and decision rules. Expressed as EVPI = EV with perfect information − EV with current information, it represents the maximum premium you’d be willing to pay today to eliminate all uncertainty about the future.

This concept captures the value of removing uncertainty: if knowing the exact future state would change your optimal choice and lead to a higher expected payoff, EVPI is that incremental value. The other ideas don’t fit because they describe different notions: the difference between the best and worst payoff is simply the range of outcomes, not the value of information; the expected value of imperfect information pertains to partial or noisy information, not perfect information; and the present value of future profits is about cash flow valuation (NPV), not about information value.