Economic agreements such as free trade agreements (FTA) or foreign direct investment (FDI) signed by two states are a frequent example of bilateralism. Since most economic agreements are signed according to the specific characteristics of the Contracting States in order to grant themselves preferential treatment, there is no need for a generalizing principle, but a situational differentiation. Thus, bilateral agreements and obligations allow States to obtain more personalized agreements and obligations, which apply only to certain States parties. However, states will face a compromise because it is more wasteful in terms of transaction costs than multilateral strategy. As part of a bilateral strategy, a new treaty must be negotiated for each participant. Thus, it tends to be favoured when transaction costs are low and the surplus of members, which corresponds to the “producer surplus” economically, is high. Moreover, it will be effective if an influential State wants to have control of small States from a liberal point of view, since the establishment of a number of bilateral agreements with small States can increase the influence of a State.  The definition of the term “Treaty” varies depending on the professional context(s). Strategic goods, such as nuclear technology, continue to be negotiated bilaterally and not in a multilateral market of openness Contract law is based on the principle expressed in the Latin phrase pacta sunt servanda (“Agreements must be respected”).  The Common Law of Contract arose from the meantime defuct writ of assumpsit, which was originally an unlawful act based on trust.  Contract law is covered by the ordinary law of obligations, together with the unlawful act, abusive enrichment and reimbursement.  The anti-globalization movement almost by definition rejects such agreements, but some groups normally allied within this movement, such as the Green Parties, aspire to fair trade or secure trade rules that mitigate the real and supposed negative effects of globalization. There are three different types of trade agreements.
The first is a unilateral trade agreement This happens when one country wants to impose certain restrictions, but no other country wants them to be imposed. It also allows countries to reduce the number of trade restrictions. It is also something that is not frequent and could affect a country. Several types of agreements are concluded within the framework of the World Trade Organization (most often in the case of accession of new members), the conditions of which apply to all WTO members on the so-called most-favoured-nation (MFN) basis, which means that the advantageous terms agreed bilaterally with a trading partner also apply to other WTO members. In rare cases, such as Ethiopia and Qing Dynasty China, local governments were able to use treaties to at least mitigate the effects of European colonization. This included learning the intricacies of European diplomatic practices, and then using treaties to prevent power from exceeding its agreement or by putting different powers in competition. [Citation required] In the United States, the term “treaty” has a different, more limited legal meaning than that of international law. U.S. law distinguishes what it calls “treaties” from “executive agreements,” which are either “congress-executive agreements” or “single executive agreements.” The classes are all treaties under international law; They differ only in the domestic law of the United States. A treaty is a formal and binding written agreement concluded by actors of international law, usually sovereign states and international organizations, but also individuals and other actors.  A treaty may also be qualified, inter alia, as an international agreement, protocol, pact, agreement, pact or exchange of letters. .