Etymology
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subsistence (n.)

early 15c., "existence, independence," from Late Latin subsistentia "substance, reality," in Medieval Latin also "stability," from Latin subsistens, present participle of subsistere "stand still or firm" (see subsist). Latin subsistentia is a loan-translation of Greek hypostasis "foundation, substance, real nature, subject matter; that which settles at the bottom, sediment," literally "anything set under." In the English word, meaning "act or process of support for physical life" is from 1640s.

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economy (n.)
Origin and meaning of economy

1530s, "household management," from Latin oeconomia (source of French économie, Spanish economia, German Ökonomie, etc.), from Greek oikonomia "household management, thrift," from oikonomos "manager, steward," from oikos "house, abode, dwelling" (cognate with Latin vicus "district," vicinus "near;" Old English wic "dwelling, village," from PIE root *weik- (1) "clan") + nomos "managing," from nemein "manage" (from PIE root *nem- "assign, allot; take").

The meaning "frugality, judicious use of resources" is from 1660s. The sense of "wealth and resources of a country" (short for political economy) is attested from 1650s, but even in the 1780s the American Founders in laying out the new republic generally used economy only as "frugality." So also in that sense in the Federalist, except in one place where full political economy is used.

Col Mason — He had moved without success for a power to make sumptuary regulations. He had not yet lost sight of his object. After descanting on the extravagance of our manners, the excessive consumption of foreign superfluities, and the necessity of restricting it, as well with oeconomical as republican views, he moved that a Committee be appointed to report articles of Association for encouraging by the advice the influence and the example of the members of the Convention, oeconomy[,] frugality[,] and american manufactures. [Madison, Sept. 13, 1787, in Farrand, "Records of the Federal Convention;" the motion was agreed to without opposition]
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economy (adj.)

1821 as a term in advertising, at first meant simply "cheaper," then "bigger and thus cheaper per unit or amount" (1950). See economy (n.).

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economist (n.)

1580s, "household manager," from French économiste; see economy + -ist. Meaning "student of political economy" is from 1804.

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subsistent (adj.)

1520s, from Latin subsistentem (nominative subsistens), present participle of subsistere "stand still or firm" (see subsistence).

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econometric (adj.)

1933, from economy + -metric. Related: Econometrics.

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macroeconomic (adj.)

also macro-economic, "pertaining to the economy as a whole," 1938, from macro- + economic.

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ineconomy (n.)

"waste of resources," 1881, from in- (1) "not, opposite of" + economy (n.).

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protectionism (n.)

"doctrine or system of protection in political economy," 1846, from protectionist + -ism.

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banana republic (n.)

"small Central American state with an economy dependent on banana production," 1901, American English.

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