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 market is one where there are numerous producers that compete with one another in hopes to provide goods and services we, as consumers, want and need. In other words, not one single producer can dictate the market. Also, like producers, not one consumer can dictate the market either.