EN
In this paper we analyze how the participation in an monetary union is influencing trade among the member states as well as with third countries. We are especially interested, whether we can expect trade intensification as a result of participation in a monetarny union. Separately we analyze what kind of gains (direct and indirect, permanent or short time) is connected with the participation in a monetary union and what conditions have to be fulfilled for achieving these gains. We also compare trade gains and costs of participation in a monetary union. This last topic we analyse from the point of view of the representatives of two main streams of economic thinking: the Keynesian and monetaristic one.