X-M: The abbreviation for net exports, which is the difference between exports, goods and services produced by the domestic economy and purchased by the foreign sector, and imports, goods and services produced by the foreign sector and purchased by the domestic economy. While exports and imports important unto themselves, when combined into a single measure net exports captures the overall interaction between the foreign sector and the domestic economy. Arithmetically speaking, if exports exceed imports, then net exports are positive, and if imports exceed exports, the net exports are negative.

     See also | net exports | exports | imports | foreign sector | foreign trade | balance of trade | foreign | domestic | aggregate expenditures | gross domestic product |

X-M, AmosWEB GLOSS*arama, http://www.AmosWEB.com, AmosWEB LLC, 2000-2025. [Accessed: July 15, 2025].

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The change in the quantity of total physical product resulting from a unit change in a variable input, keeping all other inputs unchanged. Marginal physical product, usually abbreviated MPP, is found by dividing the change in total physical product by the change in the variable input. Marginal physical product, which more often goes by the name marginal product (MP), is one of two measures derived from total physical product. The other is average physical product.

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