Although the term itself arose out of science fiction

Although the term itself arose out of science fiction, certain real-life corporations, such as colonial-era chartered companies and zaibatsu, have achieved or approached megacorporation status in various ways.  When interest rates rose to offset inflation, conglomerate profits fell. Investors noticed that the companies inside the conglomerate were growing no faster than before they were purchased, whereas the rationale for buying a company was that "synergies" would provide efficiency. Most economic textbooks follow the practice of carefully explaining the perfect competition model, only because of its usefulness to The boundaries of what constitutes a market and what doesn't are relevant distinctions to make in economic analysis.  In the 1990s there used to be 50 military personnel for every 1 contractor, now the ratio is 10 to 1 (Singer). Singer points out that these contractors have a number of duties depending on who they are hired by. In developing countries that have natural resources, such as oil refineries in Iraq, they are hired to guard the area.