 Types of default include simple defaults where one choice is automatically selected for all consumers, forced choice in which a product or service is denied until the consumer makes a proactive selection, and sensory defaults in which the choice is pre-selected based upon other information that was gathered about specific consumers.Choices that are made repeatedly may also be affected by defaults, for instance persistent defaults may be continually reset regardless of past decisions, whereas reoccurring defaults "remember" past decisions for use as the default, and predictive defaults use algorithms to set defaults based upon other related behavior.One of the most commonly cited studies on the power of defaults is the example of organ donation.