The article points out that the economic integration in the post-Soviet space results in the need of introduction of a single currency. The paper considers the main problems which can arise during creation of a single currency zone within the Eurasian Economic Community (EurAsEC): strengthening of procycricality of national economies; impossibility for the certain countries to carry out State regulation of economy with the use of tools of monetary policy and exchange rate; distribution of a seigniorage; confidence-building measures to emission center. The paper emphasizes that the strengthening of procycricality of national economies of the EurAsEC member countries, which joined a zone single currency with participation of Russia is the most considerable problem. It is connected with rather strong dependence of the Russian economy on the hydrocarbon prices at global market and its considerable volumes in comparison to economies of other participants of single currency zone. The paper provides data, which discloses an influence of a choice of principle of seigniorage distribution in single currency zone on income of the countries from issue of single currency. Such distribution can be made in proportion to the size of demand for money, in proportion to GDP, in proportion to the country's population, and also in a complex - in proportion to GDP (50%) and in proportion to population of the country (50%). While introducing single currency within the framework of two countries (The Russian Federation and Republic of Belarus) it is expedient to use the Russian ruble as single currency, which share in cumulative money supply of two countries is overwhelming. In order to solve the problem of trust to single currency as optimum, it is possible to consider the use of the Russian ruble as the EurAsEC collective currency. The use of the Russian ruble has old economic history and a certain confidence level.
Keywords: single currency, single currency zone, emission center, EurAsEC, seigniorage
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