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 mass market is a general population which can be targeted at wide for the sales and marketing of a product. To explain a mass market, it can simply be compared with a niche market. A niche market is one where a very small market segment exists. Example â Tractors are a niche market.