Trade agreements differ according to their content: in the agricultural sector, developed countries would reduce tariffs by half or more, although products considered sensitive are less reduced. Developing countries would make minor reductions and least developed countries would not have to make reductions. Trade-distorting subsidies as a whole would be capped, albeit at a level higher than the current level of subsidies for the United States. And in the services sector, there would be only a very small degree of improvement in access, because countries would in fact only accept additional links with existing practices. Among the ongoing trade negotiations between the EU and third countries is the fact that a country can also adopt a begging neighbour`s attitude by deliberately shifting the terms of trade to its advantage through the introduction of an optimal tariff or currency manipulation. In his economics manual, Dominick Salvatore defines an optimal tariff as third, Ricardo and other early economists based their theories on trade in goods, and they did not take into account the trade in factors of production. Today, however, basic production factors such as labour, capital and technology are being negotiated. The consequence of trade in factors of production is that factor compensation will be complete in a shorter period than in the commodity trade alone. Unfortunately, these rules were almost totally ineffective and today preferential trade is almost the rule, not the exception.
The WTO reports that 354 agreements were notified and came into force in January 2013. Free trade agreements account for more than 90% of these notified agreements and customs unions account for less than 10%.  In addition to these WTO/GATT-notified agreements, there are others that have not been notified or are at a very early stage of negotiations. Second, the GATS covers the provision of services through four different types of procurement, while NAFTA`s approach is to have a chapter on cross-border services (GATS-Modi 1 and 2) and a separate chapter on investment (mode 3). The importance of these rules is that the investment rules in U.S. trade agreements apply equally to all thematic areas, including goods and services. In addition, NAFTA and the Chile and Singapore agreements have their own chapter on the temporary entry of entrepreneurs (mode 4); However, the other agreements do not have provisions for the temporary entry of contractors. In addition, a number of free trade agreements in the United States provide for better market access in certain service sectors than the WTO commitments provide.  As mentioned in Chapter 1 in the 1940s, post-World War II trade architecture negotiators originally developed trade, investment and competition policy rules that should be incorporated into an International Trade Organization (ITO).