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.
Definition of Mass Market. As the name suggests, mass market is a general public market consisting of consumers belonging to various age groups, lifestyles and preferences. If a company manufactures a product which is useful to a variety of consumers across various sectors then it is said to have a mass market appeal.