Choice options “automatically” selected in the absence of a choice option selected by the respondent. (See Choice Architecture and Inertia.)
Source: Behavioral Science Lab, 2017
Default options are pre-set courses of action that take effect if nothing is specified by the decision maker (Thaler & Sunstein, 2008), and setting defaults is an effective nudge when there is inertia or uncertainty in decision making (Samson, 2014).
Source: Behavioral Economics