What is Probability Matching?
Probability matching is a decisionmaking strategy often seen in situations where individuals are tasked with predicting outcomes over a series of trials. Rather than favoring the outcome with the highest probability, an individual employing probability matching will choose outcomes in proportion to the likelihood of those outcomes occurring.
Background and Examples

Origins of the Concept
The concept of probability matching comes from the field of cognitive psychology and behavioral economics, and it is often used to study decisionmaking behaviors. Despite its intuitive appeal, probability matching is statistically suboptimal compared to the strategy of always choosing the most likely outcome, known as maximization.

Case Studies
A classic example of probability matching involves a random generator that produces a sequence of red and blue lights, with red appearing 70% of the time and blue 30%. An individual who employs a maximization strategy would always guess red, leading to an average success rate of 70%. However, an individual who employs probability matching might guess red 70% of the time and blue 30% of the time, resulting in a success rate less than 70%.
Relevance and Impact

Impact on Decision Making
Probability matching can significantly impact the decisionmaking process, often leading to suboptimal outcomes. Despite being less effective than maximization, individuals may intuitively employ probability matching as it feels more reflective of the environment’s uncertainty.

Implications for Behavioral Science
Understanding the tendency to use probability matching can help behavioral scientists, economists, and psychologists better understand decisionmaking processes, particularly in uncertain conditions. This understanding can help in designing interventions to promote more optimal decisionmaking strategies, like maximization.

Applications in Various Fields
Recognition of the probability matching phenomenon has implications in various fields, including education, finance, and public policy. For instance, it can influence the development of teaching strategies in education, decisionmaking models in finance, and risk communication strategies in public health and safety.