Inseparability is used in marketing
to describe a key quality of services as distinct from goods. Inseparability is the characteristic that a service has which renders it impossible to divorce the supply or production of the service from its consumption.
Other key characteristics of services include perishability, intangibility and variability.
1. Michael J. Thomas, Gower Handbook of Marketing p377, Gower Publishing Ltd., 1995. ISBN 0566074419