economy (n.) Look up economy at Dictionary.com
c.1530, "household management," from L. oeconomia, from Gk. oikonomia "household management," from oikonomos "manager, steward," from oikos "house" (cognate with L. vicus "district," vicinus "near;" O.E. wic "dwelling, village;" see villa) + nomos "managing," from nemein "manage" (see numismatics). 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.).