Products or services bought as a series of small purchases, rather than all at one time. Generally based on a common theme and shipped at regular or specific time intervals.
Continuity is a type of sale that comprises a senes ot sales made over time.
A closed-end continuity has a definite number of items to be delivered to the buyer.
Examples: Encyclopedias are usually sold as closed-end continuities; cookbooks are frequently sold as open-end continuities. Continuity subscribers can stop buying at any time, unlike club members, who must fulfill a member commitment prior to canceling. However, open-end continuity buyers are much more likely to cancel.