Specific language impairment (SLI) is diagnosed when a child's language does not develop normally and the difficulties cannot be accounted for by generally slow development, physical abnormality of the speech apparatus, autism spectrum disorder, acquired brain damage or hearing loss.
Perfect competition. A perfectly competitive market is a hypothetical market where competition is at its greatest possible level. Neo-classical economists argued that perfect competition would produce the best possible outcomes for consumers, and society.
Perfect competition implies an industry or market in which no one supplier can influence prices, barriers to entry and exit are small, all suppliers offer the same goods, there are a large number of suppliers and buyers, and information on pricing and process is readily available.