ABSTRACT
International trade is a very complex aspect of the transactions between the countries of the world. One complicating factor is the fact that the countries of the world vary greatly in size, with the result that some of the internal trade within the larger countries of the world may in practice be over much greater distances (e.g. between Alaska and New York, St Petersburg and Vladivostok) than international trade (e.g. between Switzerland and France, or between adjoining parts of the USA and Canada).
