The importance of the tourism sector for the successful functioning of the national economy differs considerably from one country to another. Economic research has mainly dealt with the impact of tourism on economic growth, development and employment. The subject of this paper is an examination of the tourism sector as a possible factor in reducing the balance of payments deficit in the Republic of Serbia. The goal of the research is to find out to what extent the tourism sector can contribute to the correction of the disequilibrium in balance of payments of the Republic of Serbia. Secondary data analysis, comparative methods and correlation analysis were used in the research. The results of the research indicate that the decline in imports of tourist services, due to the change of direction of domestic tourist demand, can have a positive effect on the reduction of the current account deficit and, consequently, the balance of payments deficit in the Republic of Serbia.

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Introduction. The question of how exchange rates adjust is central to exchange rate policy, since countries with fixed exchange rates need to know what the equilibrium exchange rate is likely to be and countries with variable exchange rates would like to know what level and variation in real and nominal exchange rates they should expect. In broader terms, the question of whether exchange rates adjust toward a level established by purchasing power parity helps to determine the extent to which the international macroeconomic system is self-equilibrating Analysis of recent researches and publications has shown that the published up to date papers aren’t systematic and can’t claim to be a complete analysis in the chosen field. The aim is to test the validity of PPP hypothesis in the long run in former and current European transitional economies. Methods. General scientific methods such as the systematic approach, theo­retical generalization and comparison, analysis, synthesis and the Levin–Lin–Chu (LLC) panel unit root test have been used in the research. Research results. This paper tests the validity of purchasing power parity (PPP) hypothesis in the long run in selected European transitional economies. The database used in this paper contains monthly data on real effective exchange rate (REER) observed over 23 years, from March 1995 till November 2017. To test the hypothesis, the Levin–Lin–Chu (LLC) panel unit root test was employed. The results confirm that PPP holds both for Central European and Western Balkan states in the long run. Conclusions. The equilibrium exchange rate question is central question to exchange rate policy. Purchasing power parity hypothesis was tested on the sample of 14 European countries form the Central and Eastern Europe and Western Balkan region. The database used in this paper contains monthly data on real effective exchange rate –REER observed over 23 years, from March 1995 till November 2017. As PPP holds if the real exchange rate reverts to its equilibrium value over time, the unit root test was applied on panel REER dataset. The results of applied Levin–Lin–Chu (LLC) panel unit root tests confirmed that the PPP hypothesis holds for selected countries during the observed period. Additionaly, results confirmed that PPP hypothesis holds both for CEE and Western Balkan countries separately.

During the 20th century, the dollar gained the status of the world's most important currency. Therefore, the Bretton Woods International Monetary System was based on the dollar. However, in the 1970s, the situation changed significantly -demand for dollars declined, the currencies of the most important European countries became convertible, the volume of international trade increased greatly, international capital flows were liberalized, the external convertibility of the dollar to gold was abolished, and the currencies began to fluctuate. In this way, the original Bretton Woods international monetary system ceased to exist. In addition to the changes, the functioning of the international monetary system is greatly impacted by the fact that the United States recorded an increasing amount of current account deficits from year to year and, in the 1980s, moved from the position of the net creditor to that of the net debtor, that the euro was created on the soil of the EU and that China became the world's largest exporter and one of the largest (if not the largest) world economies. For this reason, the theoretical assumptions of the international monetary system are systematized in the paper, the role of other world currencies is examined, and the question of why the dollar continues to be the dominant world currency is answered.