Because of the complex nature of commercial relations at the present day, changes of policy in government, etc., the treaty in detail (q. v.) would be imprac- ticable between states, inasmuch as they would be subject to constant amendment. In order, therefore, for states to preserve their rights and to prevent any future dis- criminations unfavorable to them and to their commerce, they have adopted two methods to supplant the treaty in detail. They are: (1) National Treatment, (2) Most favored nation treatment, or (3) a combination of both. As a general rule, national treatment secures to the foreign merchant who enjoys its benefits the same rights and privileges as a native subject or citizen in all that con- cerns his residence, property, commercial transactions and the importation and sale of his goods, and it obtains for the foreign state the same treatment of its merchant vessels as is secured to native vessels. Most favored nation treatment, on the other hand, leaves each party free to make what internal regulations it pleases, and to give what preference it finds expedient to native merchants, vessels and productions. Its object is to prevent any unfair dis- crimination against the merchants, vessels and productions of the contracting party in favor of those of another state, and, owing to its greater scope, the privileges secured by it may be superior to those secured by national treatment. Imports being in their essence foreign, it is impossible that they receive national treatment. The rate of duty on them must be fixed either by a treaty wholly, or in part, in detail, by a supplementary convention confined to duties on imports and exports, or by the legislature of the state; and the favored nation clause is usually resorted to by foreign states to secure an uniformity of charges and to prevent unfair discriminations. The article enjoins the spirit of fair and equal legislation and is designed as a stipu- lation that no unfriendly regulations shall be resorted to by one party against the other, nor any preference given in the future with an intent to injure or prejudice either party. Its object is two fold, to supply omissions by covering the whole field of commerce and navigation, or other matters of which it treats, and to insure fair and equal treatment in these respects during the life of the convention. The ordinary forms of the clause as it appears in modern treaties are as follows: (a) The simply reciprocal form. "The high contracting parties agree, that, in all that concerns commerce and navigation, any privilege, favor, or immunity which either contracting party has already granted, or may hereafter grant to any other state, shall become common to the other party. (b) The qualified reciprocal form, s0 called because of the qualifying clause appended owing to the many discussions concerning the interpretation of "favor." (c) The imperative and unconditional form. (d) The unilateral form appearing in treaties between Christian or civilized, and semi-civilized states, whereby the civilized power reserves to itself alone favored nation treatment, usually imperative and uncon- ditional. (e) The specialized or contrac- ted form which applies to but one subject of commerce, as for instance, "imports." Herod, Favored Nation Treatment, 2-6.