Trade barriers are government-induced restrictions on international trade. According to the theory of comparative advantage, trade barriers are detrimental to the world economy and decrease overall economic efficiency.
Most trade barriers work on the same principle: the imposition of some sort of cost (money, time, bureaucracy, quota) on trade that raises the price or availability of the traded products. If two or more nations repeatedly use trade barriers against each other, then a trade war results. Barriers take the form of tariffs (which impose a financial burden on imports) and non-tariff barriers to trade (which uses other overt and covert means to restrict imports and occasionally exports). In theory, free trade involves the removal of all such barriers, except perhaps those considered necessary for health or national security. In practice, however, even those countries promoting free trade heavily subsidize certain industries, such as agriculture and steel.
High-income countries tend to have fewer trade barriers than middle income countries which, in turn, tend to have fewer trade barriers than low income countries. Small states tend to have lower trade barriers than large states. The most common trade barriers are on agricultural goods. Textiles, apparel and footwear are the manufactured goods which are most commonly protected by trade barriers. Tariffs have been declining in the last twenty years as the influence of the World Trade Organization has grown, but states have increased their use of non-tariff barriers.
According to Chad Bown and Meredith Crowley, world trade is "probably" vastly more liberal in current times than was the case historically. According to Ronald Findlay and Kevin H. O’Rourke, "for the nineteenth and twentieth centuries trade barriers and transport costs were the most important barriers to trade". They also write, "during the mercantilist era price gaps were as likely to be due to trade monopolies, pirates, and wars as to transport costs and tariffs, which are more easily quantifiable.
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An export in international trade is a good produced in one country that is sold into another country or a service provided in one country for a national or resident of another country. The seller of such goods or the service provider is an exporter; the foreign buyers is an importer. Services that figure in international trade include financial, accounting and other professional services, tourism, education as well as intellectual property rights. Exportation of goods often requires the involvement of customs authorities.
Non-tariff barriers to trade (NTBs; also called non-tariff measures, NTMs) are trade barriers that restrict imports or exports of goods or services through mechanisms other than the simple imposition of tariffs. Such barriers are subject to controversy and debate, as they may comply with international rules on trade yet serve protectionist purposes. The Southern African Development Community (SADC) defines a non-tariff barrier as "any obstacle to international trade that is not an import or export duty.
The General Agreement on Tariffs and Trade (GATT) is a legal agreement between many countries, whose overall purpose was to promote international trade by reducing or eliminating trade barriers such as tariffs or quotas. According to its preamble, its purpose was the "substantial reduction of tariffs and other trade barriers and the elimination of preferences, on a reciprocal and mutually advantageous basis.
Local nonlinear gyrokinetic simulations of tokamak plasmas demonstrate that turbulent eddies can extend along magnetic field lines for hundreds of poloidal turns when the magnetic shear is very small. By accurately modeling different field line topologies ...
IOP Publishing Ltd2023
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The turbulence characteristics of plasmas with internal transport barriers in the HL-2A tokamak are analyzed by means of linear gyrokinetic simulations. It is found that turbulence is dominated by the ion temperature gradient (ITG) mode together with large ...
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