used from c. 1946 in a variety of senses, both by those supporting and those opposed to whatever it was: American intervention in foreign conflicts, a global foreign policy; supremacy of global institutions over national ones; a worldwide extension of capitalist market systems; from global + -ism. Related: Globalist.
"fasten with or as if on a peg, drive pegs into for the purpose of fastening," 1590s, from peg (n.). Meaning "fix the market price" is by 1882. Slang sense of "identify, classify" is recorded by 1920. Related: Pegged; pegging.
"a state of limited competition in which a market is shared by a few producers or sellers," 1887, from Medieval Latin oligopolium, from Greek oligos "little, small," in plural, "the few" (a word of uncertain origin) + pōlein "to sell" (from PIE root *pel- (4) "to sell."). Related: Oligopolist.