In behavioral economics, inertia is the endurance of a stable state associated with inaction and the concept of status quo bias (Madrian & Shea 2001). In social psychology the term is sometimes also used in relation to persistence in (or commitments to) attitudes and relationships. Decision inertia is frequently counter-acted by setting defaults.
Madrian, B., & Shea, D. (2001). The power of suggestion: Inertia in 401(k) participation and savings behavior. Quarterly Journal of Economics, 116, 1149-1187.