abstract:Marginal Intra-Industry Trade, a concept originating in international economics, refers to the phenomenon where the change in a country's exports over a certain period of time are essentially of the same products as its change in imports over the same period. The concept is therefore closely related to that of intra-industry trade, that being the export and import of the same items, but concerns changes in exports and imports between two points in time as opposed to their values at a given point in time.