economy (n.) Look up economy at Dictionary.com
1530s, "household management," from Latin oeconomia, from Greek oikonomia "household management, thrift," from oikonomos "manager, steward," from oikos "house" (cognate with Latin vicus "district," vicinus "near;" Old English wic "dwelling, village;" see villa) + nomos "managing," from nemein "manage" (see numismatic). The sense of "wealth and resources of a country" (short for political economy) is from 1650s.
economy (adj.) Look up economy at Dictionary.com
as a term in advertising, at first meant simply "cheaper" (1821), then "bigger and thus cheaper per unit or amount" (1950). See economy (n.).