In probability theory and statistics, a **zero-order process** is a stochastic process in which each observation is independent of all previous observations. For example, a zero-order process in marketing would be one in which the brands purchased next do not depend on the brands purchased before, implying a fixed probability of purchase.

- Ward, Scott; Robertson, Thomas S. (1973).
*Consumer behavior: theoretical sources*. Prentice-Hall. p. 536. ISBN 0131693913.

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