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System for the sale of alcohol in the U. S. put in place after the repeal of Prohibition
The three tier system of alcohol distribution is the system for distributing alcoholic beverages set up in the United States after the repeal of Prohibition. The three tiers are importers or producers; distributors; and retailers. The basic structure of the system is that producers can sell their products only to wholesale distributors who then sell to retailers, and only retailers may sell to consumers. Producers include brewers, wine makers, distillers and importers. The three tier system is intended to prohibit tied houses and prevent "disorderly marketing conditions." Some states chose to become alcoholic beverage control jurisdictions after Prohibition. In these states, part or all of the distribution tier, and sometimes also the retailing tier, are operated by the state government itself (or by contractors operating under its authority) rather than by independent private entities. The only state with a privately operated retailing and distribution system that does not require any form of three tier system is the State of Washington. In Washington, retailers may purchase alcoholic beverages directly from producers, may negotiate volume discounts, and may warehouse their inventory themselves. However, the three tier system largely remains in fact a reality in Washington despite the lack of a law requiring it.

In 1933 the 18th Amendment was repealed by the 21st Amendment. (Previously, the 18th Amendment had outlawed alcohol in the US in 1919 and led to Prohibition in 1920.) Section 2 of the 21st Amendment specifies that the power to control alcohol resides with the states, leaving each state to decide when and how to repeal Prohibition. After Prohibition, the states began to seek methods to regulate and control the alcohol industry. The states were also eager to devise a method to levy and collect taxes on alcohol producers. Both of these concerns led to the states individually creating environments in which single ownership of all three tiers (production, distribution and retail) was entirely or partly prohibited. As states were left by the 21st Amendment to regulate themselves, alcohol laws and the nature of the three tier system can vary significantly from state to state.

States have various exceptions to this rule, the most prevalent one being the case of a brewpub, which is simultaneously a producer and retailer, and has no requirement to sell to a distributor. Some states allow an entity to have a part in two of the tiers, letting small breweries act as their own distributor, for example. Many states permit wineries to sell bottles of wine on site to customers. Usually producers will give a distributor exclusive rights to market their product within a geographical area, so that there will not, for example, be two distributors of Anheuser Busch products competing against each other. Rules also vary according to what kind of relationships each of the tiers can enter into with the other two tiers. For example, a producer may not be allowed to give promotional items or services to a retailer. Another example is that a beer distributor might be responsible for setting up and maintaining draft lines in a restaurant, or may be legally prohibited from doing so, depending on the state. Also, several states are alcoholic beverage control states in any of these jurisdictions state governments maintain a monopoly on the distribution tier of the system (at least for distilled beverages). Some (such as Utah and Pennsylvania) monopolize the distribution and retail tiers. Those that maintain monopolies over the distribution system only (such as Michigan) could still be said to have a three tier system – in such states producers sell to the distributor (in these cases, the state as opposed to a private operator) who in turn sells to private retail outlets. The only substantial exception to the three tier system is the State of Washington. In November 2011, voters in Washington approved Initiative 1183, which dismantled the state operated retailing system and removed the legal requirement for a three tier distribution system for alcoholic beverage sales. Under the modified law, the prior state operated liquor retailing system was eliminated in favor of heavily taxed private retailing. By a substantial margin, Washington has the highest liquor tax rate in the nation. In Washington, retailers may bypass distributors by purchasing directly from producers, may negotiate volume discounts, and may warehouse their inventory themselves. Private retailing began on June 1, 2012. Although private retailing should increase competition in principle, in many cases producers have entered into exclusive marketing agreements with distributors for the market region, to the extent that each brand is often only available from a single distributor in the state (although large retailers such as Costco have been able to take some advantage of the law and in some cases have introduced their own house brands).

Wine and Spirits Wholesalers of America (WSWA), an influential trade organization and lobby group based in Washington, D. C. that works to oppose initiatives to alter the three tier model, contends that wholesalers not only sell alcohol but also perform state functions and are in the business of encouraging social responsibility concerning alcohol. The National Association of Wine Retailers represents the wine retail industry, advocating for the free movement of wine across state lines.

A similar use of a three tier system is enforced for tobacco products in some jurisdictions. They argued that this would improve tax collection enforcement.