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.
A competitive advantage is one gained over competitors by offering consumers better value. You increase value by lowering prices or increasing benefits and services to justify the higher price. Differentiation and cost leadership strategies search for competitive advantage on a broad scale, while focus strategies work in a narrow market.