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.
It's time to start getting honest about a very simple fact: Nobody, but nobody, really believes in free markets. That's right. Not the Republican Party, not the libertarians, not the Wall Street Journal, nobody. Here's why: a truly free market is a perfectly competitive market. Which means that whatever you have to sell in that market, so does your competition. Which means price war. Which means your price gets driven down. Which means little or no profit for you. Oops! Naturally, businesses flee perfectly competitive markets like the plague.