The gravity model is adapted from Newton’s Law of Gravity, and in essence states that the attraction of goods between countries depends positively on their economic masses, and negatively on the distance between them.Gravity equation is adaptable to determination of the equilibrium level of international trade. Variables of the model can be income of the countries, distances between them, relative prices of them, and any factors promoting or set backing the external trade. The aim of the paper is to review theory of the gravity equation and compare the adaptation with each other with regard to the investigation of foreign trade possibilities.
