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 and Characteristics of Pure Competition. Pure competition is a term that describes a market that has a broad range of competitors who are selling the same products. It is often referred to as perfect competition. Here are some characteristics that define a pure competition. 1  In an ideal purely competitive market, the products being sold would be identical, which removes the option of one seller offering something different or better than another seller.