International monetary system is a set of internationally agreed rules, conventions and supporting institutions that facilitate international trade, cross border investment and generally the reallocation of capital between states that have different currencies. It should provide means of payment acceptable to buyers and sellers of different nationalities, including deferred payment. To operate successfully, it needs to inspire confidence, to provide sufficient liquidity for fluctuating levels of trade, and to provide means by which global imbalances can be corrected. The system can grow organically as the collective result of numerous individual agreements between international economic factors spread over several decades. Alternatively, it can arise from a single architectural vision, as happened at Bretton Woods in 1944. International trade is the exchange of capital, goods, and services across international borders or territories because there is a need or want of goods or services.