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]