International trade is basically around the progressive cost and advantage of the principle of evolution. Countries tend to produce products with cost and quality advantages and sell them to countries that do not have the above advantages.

In reality, although it has a very complex dynamics. International trade involves not only the exchange of goods and services between the two countries, but also the exchange of currencies. As buyers and sellers come from two different countries, there are also uncertainties. Importer (buyer) about the quality and quantity of the goods, and the seller (exporter) about the payment. In order to reduce this tension, a number of international norms and rules have been developed.

UCPDC is the main rule. The starting point of international trade is the buyer's inquiry for potential suppliers. Second is the exchange of catalogues, specifications, samples, in some cases the material for physical inspection and ordering.

Next is the shipping and payment settlement. Chambers of Commerce and export promotion committees of these countries play an important role in promoting trade. Banks play a greater role in processing documents and ensuring payment settlement. There are other key equity holders, such as certification bodies, clearing and forwarding agencies, of course merchant ships, airlines and other modes of transport, rather than forgetting insurance companies.

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