UNCTAD`s Work Programme on International Investment Agreements (IAA) actively supports policy makers, government officials and other IIA stakeholders in the IIA reform to make them more conducive to sustainable development and inclusive growth. International investment rules are established at bilateral, regional, inter-regional and multilateral levels. It requires policy makers, negotiators, civil society and other stakeholders to be well informed about foreign direct investment, international investment agreements (AI) and their effects on sustainable development. Key objectives of UNCTAD`s IIA work programme – Reform of the International Investment Agreements (IIA) regime to improve the dimension of sustainable development; A comprehensive analysis of key issues arising from the complexity of the international investment regime; Development of a wide range of instruments to support the development of a more balanced international investment policy. In addition to these examples, there is a specific FTA term called the « Ratchet Mechanism »[1] or « Unilateral liberalisation of new services automatically engages within the framework of this specific agreement. » This mechanism, if included in the free trade clause, is only one way to prevent, particularly for trade in services and investment parties, from modifying or improving national legislation, directives or regulations and not being replaced by more restrictive amendments than previous conditions. For example, this mechanism was designed to ensure that measures taken under national legislation become increasingly beneficial free trade agreements, which have become a major social and political issue in Thailand since former Prime Minister Thaksin Shinawatra agreed in 2003 to negotiate a comprehensive bilateral agreement with the United States. A broad multi-sector coalition in Thailand, called ftA Watch, monitors and mobilizes quite often around Thailand`s free trade policy, given the deep and broad nature of these agreements for Thai society. The purpose of the DBAs is to reduce the double taxation of income in one jurisdiction that is that of a resident of another resident. The Agreement on Double Taxation between Singapore and Thailand (DBA) provides an exemption from double taxation in the situation in which income is taxed for both countries.