Throughout history, international trade has proven to be one of the most important disciplines in economics. In the modern world, almost all countries actively participate in the international market and almost all of them function as an open economy. The reason for this is the contribution of foreign trade, i.e. exports and imports, to the faster economic growth and development. Comparative advantages play a big role in international trade. Countries are able to import products and services that they could not produce at all or could not produce efficiently enough on their own. Precisely for this reason, countries specialize in the production of certain products and services with the lowest opportunity cost. Openness to the international market means that economies can achieve competitiveness in comparison to other participants and can achieve a higher standard of living for their residents. Gross domestic product is one of the most used and widely accepted indicators of the economic well-being of a country. It's components are personal consumption, investments, government consumption, imports and exports. Imports and exports form a foreign trade balance that indicates the state of an economy as a net creditor or a net debtor. Countries strive for higher exports, which bring a positive contribution to the economy overall, and achieve a multiplier effect on real GDP. The multiplier effect means a greater change in the dependent variable than the change in the independent one that affects it, and is explained by the circular flow of money in the economy. The multiplier effect can be shown trhough comparative statics and dynamics. The difference between the displays is the number of periods during which the change in real GDP takes place and the possibility of change in the value of other variables during the dynamic calculation. The dynamic multiplier is often applied in economics because it provides the possibility of predicting the movement of real GDP when its components change.