"Megacorporation" is a term popularized by William Gibson derived from the combination of the prefix mega- with the word corporation. It has become a term popularly used in cyberpunk literature. It refers to a corporation (normally fictional) that is a massive conglomerate, holding monopolistic or near-monopolistic control over multiple markets (thus exhibiting both a horizontal and a vertical monopoly). Megacorps are so powerful that they can ignore the law, possess their own heavily-armed (often military-sized) private armies, hold 'sovereign' territory, and possibly even act as outright governments. They often exercise a large degree of control over their employees, taking the idea of 'corporate culture' to an extreme. Such organizations are a staple of science fiction long predating cy