Define and Relate the following concepts or entities and relate them whenever possible also relate these concepts to one another as they are all pat of the foundation of International Business Transactions IMF World Bank United Nations WTO GATT Tariffs Non tariff trade barriers MFN and NTR Treaty Power under US Constitution Difference between trade treaty and trade agreement Power of Congress and Power of President in trade matters and delegation of authority US Trade Representative INCO Terms Documentary Sale Bill of Lading Commercial Invoice Certificate of Origin Negotiable Instrument Letter of credit Line of credit .