perfect information

In mathematics and economics, the concept of "perfect information" refers to situations where all parties involved in a transaction or game have access to the same, complete set of relevant data. This contrasts with "asymmetric information," where one party possesses more knowledge than the other.12

In games of perfect information, such as chess or checkers, players can deduce optimal strategies because all available information is known to everyone. This means the outcome of the game is predetermined if both players play perfectly. However, the complexity of these games, like chess with its vast number of possible moves, makes it practically impossible to calculate every outcome, even with advanced technology.3

In economics, asymmetric information can lead to market inefficiencies, as seen in the example of the secondhand car market, where sellers know more about a car's quality than buyers. This can result in only low-quality goods ("lemons") being traded, or the absence of certain markets altogether.2