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.
The state of long-run equilibrium in a competitive market, otherwise known as perfect competition in the long run, is quite similar to a long-term competitive monopoly. In the latter case, demand for a product eventually increases along with the cost, which also levels a firm s revenue to zero profit margins.erfect Competition. Zero economic profit most often arises in perfect competition, as it is typically a result of competitive businesses driving down profits and preventing a firm from earning more money than it spends in production costs.