Value of Information

Value of information (VOI) is how much a piece of information is worth to a decision, judged by whether knowing it could change what you choose. In competition, information that should change your next action is positive VOI (+VOI), and noise that shouldn't is negative VOI (-VOI).

What value of information means in decision theory

Decision analysts developed the idea in the 1960s, and Ronald Howard's 1966 paper "Information Value Theory" gave it its classic form. Its central question is simple: before you choose, how much should you be willing to pay to learn something? The answer is the difference between the outcome you expect if you decide with the information and the outcome you expect if you decide without it.

One consequence surprises people. Information that couldn't change your decision is worth zero to that decision, however interesting it is. A doctor who would prescribe the same treatment whatever a test shows gains nothing from ordering the test. Value comes from the possibility of acting differently.

Competition as an information war

Edge: The Art of Ruthless Competition builds on this with a concept from computer science: the search space, the range of possible choices. Every move in a match reshapes the search space, and good players try to make it wide and unpredictable for opponents while keeping it narrow and predictable for themselves. That gap is what information asymmetry means. Poker shows it plainly: players act partly to narrow the range of hands an opponent could hold, and the narrower the range, the more decisively they can act.

Players widen an opponent's search space in two opposite ways.

Information deprivation keeps information sparse, so the opponent feels like they're walking into battle blindfolded. Silence and secrecy are the tools. Poker professionals wear sunglasses and headphones for exactly this reason.

Information overload throws so much at the opponent that the search space seems endless, which freezes their decisions. Some poker players talk through every hand and react opposite to what their cards suggest, burying any useful signal in static.

"If players only have moments to make decisions, it's useful to give them sparse information, and preferably sparse and false information."

Edge, Play the Player: Value of Information

+VOI and -VOI

Creating confusion for opponents is the offensive half (see VUCA). Value of information is the defensive half: a way to score each incoming signal and decide whether to act on it.

"It all starts with a question: will this information change how I act in the future?"

Edge, Play the Player: Value of Information

Yes means +VOI. A firm no means -VOI: noise that won't help, at least not right now. Edge uses a news example. A national political story can stir up strong feelings and still change nothing about your day, while a local road closure changes your drive to work tomorrow. One is -VOI, the other +VOI.

Formal decision theory never assigns free, accurate information a negative value. The competitive label is practical shorthand: -VOI marks information that costs attention without improving a decision, and in a match, a lot of it was planted by the other side.

Fake signals and the three jabs

Opponents game your VOI judgments on purpose. A faked signal of weakness is meant to read as -VOI, so you keep doing what you're doing right up until they exploit it. Edge describes a fighter who throws three plain jabs in a row so the opponent files the jab as just a jab. The fourth one starts a combination.

A faked signal of strength is meant to read as +VOI and provoke a change. Picture a football defense lining up to stop the run: the offense switches to a pass, and the defense drops into the coverage it planned all along. A poker bluff works the same way: a strong-looking bet with nothing behind it, designed to make you fold.

How to get better at it

Evaluate everything an opponent shows you during a match, and make the sorting automatic: +VOI or -VOI. Then go one step further and ask whether they're trying to game that judgment. Reads built this way are worth more than almost any physical edge.

"A player who can consistently get accurate reads on their opponent has an edge that can overcome almost any other advantage they may possess."

Edge, Play the Player: Value of Information

Related concepts

VUCA | Deception | Tilt | Expected value | Edge

Frequently asked questions

What is value of information?

Value of information (VOI) is how much a piece of information is worth to a decision. In decision theory it's the improvement in expected outcome you get from learning something before you choose. Information that couldn't change your choice is worth nothing to that decision.

What is +VOI and -VOI?

In Edge, +VOI (positive value of information) is information that should change how you act next, and -VOI (negative value of information) is noise that shouldn't. Sorting signals into these two bins quickly is a defensive skill against opponents trying to confuse you.

Can information have negative value?

In formal decision theory, free and accurate information never lowers the expected value of a rational decision. Competition uses the label -VOI as practical shorthand: it marks information that won't help you, or that an opponent planted to mislead you, so it costs attention and can lead you astray.

How do competitors use information as a weapon?

Two ways: information deprivation, giving opponents as little as possible (a calm poker face, hidden plans), and information overload, flooding them with noise and false signals until they can't find the real ones. A boxer who throws three plain jabs before turning the fourth into a combination is training the opponent to file the jab as noise.