Under the New World Economy, material needs were no longer the focus or driving force of many people, rather, it was self-improvement, self-enrichment and the betterment of all. This effectively eliminated social problems like hunger and poverty and, as a result, money was no longer used. Humans took great pride in this, describing themselves as having "grown out of their infancy." The Federation, however, continued to deal with other cultures which had money-based economies, using credits, trade or negotiation instead. (Star Trek IV: The Voyage Home, TNG: "The Neutral Zone" , "The Price" , "Time's Arrow, Part II" , Star Trek: First Contact)