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When a firm of the country A export their goods, it earns the country B's currency.  But the B's money is of no use in the country A, so the firm has to buy it

My text book says as if this $NX$ and $S-I$ graph can explain everything, like even when the economy experiences trade deficit. But shouldn't $S-I$ be a minus value when it's in a deficit? Then how could one adjust this graph for that? Could it be that the 0 point is placed between $NX_2$ and $NX_1$? (assuming $S_2$ < $I$ < $S_1$)

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