The United States and the Republic of Korea signed the U.S.-Korea Free Trade Agreement (KORUS Free Trade Agreement) on June 30, 2007. The United States and the Republic of Korea implemented the agreement on March 15, 2012. At the international level, there are two large open-access databases, developed by international organizations for policy makers and businesses: there are significant differences between unions and free trade zones. Both types of trading blocs have internal agreements that the parties enter into to liberalize and facilitate trade between them. The key difference between unions and free trade zones is their approach to third parties [lack of ambiguity needed]. While a customs union requires all parties to apply and maintain identical external tariffs on trade with non-parties, parties to a free trade area are not subject to such a requirement. Instead, they can set and maintain any customs regime for imports from non-parties, as they see as necessary.  In a free trade area without harmonized external tariffs, the parties will adopt a system of preferential rules of origin to eliminate the risk of trade diversion [necessary ambiguities].  Both trade creation and trade diversion have a decisive impact on the establishment of a free trade agreement. The creation of trade will result in a shift in consumption from a cost producer to a low-cost producer, which will lead to an expansion of trade. On the other hand, trade diversion will mean that trade will move from a low-cost producer outside the zone to a more expensive producer in the free trade agreement.
 Such offshoring will not benefit consumers under the free trade agreement, which will be deprived of the opportunity to purchase cheaper imported goods. However, economists note that trade diversion does not always harm the overall national well-being: it can even improve national well-being as a whole if the volume of misappropriated trade is low.  The agreement came into force on August 1, 2006. All bilateral trade in industrial goods and consumer goods will be exempt from tariffs as soon as the agreement enters into force. In addition, Bahrain and the United States will provide immediate duty-free access to virtually all products in their tariff plans and will eliminate tariffs on the handful of remaining products within 10 years. Other restrictions on the FTA tariff instrument are that it only covers trading partners with whom the United States has a trade agreement, and product descriptions for tariff plans not published in English are in a foreign language, such as Spanish or French. Please ask questions: FTATariffTool@trade.gov It should be noted that the qualification for the original criteria is different between inputs originating and out of a free trade agreement. Inputs originating from a foreign party are normally considered to originate from the other party when they are included in the manufacturing process of that other party.