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The current account is an important indicator of an economy's external sector. It is defined as the sum of the balance of trade (goods and services exports minus imports), net income from abroad, and net current transfers.
In physics, a mass balance, also called a material balance, is an application of conservation of mass [1] to the analysis of physical systems.By accounting for material entering and leaving a system, mass flows can be identified which might have been unknown, or difficult to measure without this technique.