consumer n.

late 14c., "to destroy by separating into parts which cannot be reunited, as by burning or eating," hence "destroy the substance of, annihilate," from Old French consumer "to consume" (12c.) and directly from Latin consumere "to use up, eat, waste," from assimilated form of com-, here perhaps an intensive prefix (see com-), + sumere "to take," from sub- "under" (see sub-) + emere "to buy, take" (from PIE root *em- "to take, distribute").

Specifically, "to destroy by use, wear out by applying to its natural or intended use" from c. 1400. Sense of "to engage the full attention and energy of" is from 1570s.

1922, "protection of the consumer's interest," from consumer + -ism. It also was used mid-20c. as an alternative to capitalism to describe the Western consumer-driven economic system as a contrast to state-centered Soviet communism. By 1960 it had shaded into "encouragement of consumption as an economic policy." Related: Consumerist (1965, n.; 1969, adj.).

Coined words are often spurious. When assayed they lack the pure gold of true meaning. But here is one, minted by an engineer named Sidney A. Reeve, which looks like legal tender. As the bank tellers say, it stacks. The word is "Consumerism." [Collier's, March 1, 1924, quoting the magazine's editorial of June 3, 1922]

1510s, "one who or that which produces;" agent noun from produce (v.). Of entertainments, from 1891; in political economy, "one who causes any article to have an exchangeable value" (opposed to consumer), by 1714 (John Locke).