The trade balance (NX = X - M) is derived from the GDP expenditure identity Y = C + G + I + NX, where a trade surplus occurs when exports exceed imports (positive NX) and a trade deficit occurs when imports exceed exports (negative NX), demonstrating that both situations arise from the same mathematical relationship.
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NX = X − M · The Trade Balance From One Identity #ShortsAdded:
Y plus M equals C plus G plus I plus X.
Subtract M from both sides. You get Y equals C plus G plus I plus X minus M.
The expenditure form of GDP. Now look at the trade part. X minus M, net exports, the trade balance. If X exceeds M, the country exports more than it imports, trade surplus. If M exceeds X, the country imports more than it exports, trade deficit. Quick example. Exports of 600, imports of 250. The trade balance is 350, trade surplus. Flip the numbers.
Imports of 600, exports of 250. Trade deficit of 350. Same arithmetic, opposite sign. Both situations arise from the same accounting identity.
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