In 1987, when the guideline regarding conditions was revised for the fifth time, services were brought into consideration, and, consequently, the domestic regular air passenger transport service industry, the domestic basic telecommunications industry, and the international basic telecommunications industry1 came to be monitored for monopolistic conditions. However, because services offered by these industries are highly public in nature and indispensable to people's lives, various regulatory measures have already been taken. These include the entry regulation, the fee regulation based on the method of fair remuneration rates, and the regulation regarding operating multiple lines of businesses. Therefore, unlike other industries, these industries operate under the condition of competition under government regulation. In what follows, we will examine two of these three industries: the domestic basic telecommunications industry and the international basic telecommunications ind...