509. Direct investment is a category of international investment in which a resident entity in one economy (the direct investor) acquires a lasting interest in an enterprise resident in another economy (the direct investment enterprise). Direct investment implies a long-term relationship between the direct investor and the direct investment enterprise and a significant degree of influence by the direct investor on the management of the direct investment enterprise. Direct investment comprises the initial transaction between the two entities—that is, the transaction that establishes the direct investment relationship—and all subsequent transactions between the entities and among affiliated enterprises, both incorporated and unincorporated.