Balance of trade

The balance of trade (or net exports, sometimes symbolized as NX) is the difference between the monetary value of exports and imports of output in an economy over a certain period. It is the relationship between a nation's imports and exports.[1] A positive or favorable balance of trade is known as a trade surplus if it consists of exporting more than is imported; a negative or unfavorable balance is referred to as a trade deficit or, informally, a trade gap. The balance of trade is sometimes divided into a goods and a services balance.

Early understanding of the functioning of balance of trade informed the economic policies of Early Modern Europe that are grouped under the heading mercantilism. An early statement appeared in Discourse of the Common Weal of this Realm of England, 1549: "We must always take heed that we buy no more from strangers than we sell them, for so should we impoverish ourselves and enrich them.