Economists and marketers use of the Search, Experience, Credence (SEC) classification of goods and services, which is based on the ease or difficulty with which consumers can evaluate or obtain information. These days most economics and marketers treat the three classes of goods as a continuum. Archetypal goods are: Economists and marketers use of the Search, Experience, Credence (SEC) classification of goods and services, which is based on the ease or difficulty with which consumers can evaluate or obtain information. These days most economics and marketers treat the three classes of goods as a continuum. Archetypal goods are: A search good is a product or service with features and characteristics easily evaluated before purchase. In a distinction originally due to Philip Nelson, a search good is contrasted with an experience good. Search goods are more subject to substitution and price competition, as consumers can easily verify the price of the product and alternatives at other outlets and make sure that the products are comparable. Branding and detailed product specifications act to transform a product from an experience good into a search good. A credence good (or post-experience good) is a good whose utility impact is difficult or impossible for the consumer to ascertain. In contrast to experience goods, the utility gain or loss of credence goods is difficult to measure after consumption as well. The seller of the good knows the utility impact of the good, creating a situation of asymmetric information. Examples of credence goods include; Credence goods may display a direct (rather than inverse) relationship between price and demand—similar to Veblen goods, when price is the only possible indicator of quality. A consumer might avoid the least expensive products to avoid suspected fraud and poor quality. So a restaurant customer may avoid the cheapest wine on the menu, but instead purchase something slightly more expensive. However, even after drinking it the buyer is unable to evaluate its relative value compared to all the wines they have not tried (unless they are a wine expert).