Abstract
This article analyzes the inflation process before and after a new country with a middle-income joined the eurozone. It starts with comparative price level gaps in the European single market and with a reformulated basic macroeconomic model for a country adopting the euro. The inflation process in Slovenia is analyzed with the Phillips curve. The Phillips curve before adoption of the euro is a classical equation with the NAIRU and the nominal exchange rate as a control variable. It was expected that the Phillips curve would have to be modified after the euro was adopted. The Phillips curve after the euro was adopted should take into account the initial comparative price level gap, the law of one price, and the Balassa effect. The result is higher differential inflation; that is, national inflation is higher compared with the rate in the eurozone. Differential inflation may have a detrimental effect on export-driven catch-up growth. Instruments for taming inflationary pressure could include a higher unemployment rate and lower growth of labour unit costs.
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Notes
Before adopting the euro, Slovenia used a definition that expressed the nominal exchange rate as the price of foreign currency in terms of the domestic currency (e.g., EUR 1 = SIT 239.64; SIT = Slovenian tolar).
For more about groupings and differential growth in Europe, see the article by Senjur (2007).
Similar approach has been taken in the economic growth literature dealing with the topic of convergence (Sala-i-Martin 1996).
Data are taken from Eurostat Yearbook 2009 and from issues of earlier years.
It is assumed that there are permanent comparative price level differences that could be regarded as normal or equilibrium. However this question was not investigated.
The author is not aware of any study that calculates a sustainable or even an equilibrium price level gap for Slovenia at the time it adopted the euro. The official Bank of Slovenia exchange rate for the Slovenian tolar (SIT) in relation to the euro on 31 December 2006, which was EUR 1 = SIT 239.64, was taken as the actual conversion rate of tolars into euros on 1 January 2007, when the country adopted the euro. At such a conversion rate, the average level of prices in Slovenia was 26 per cent lower than in the eurozone. At a lower conversion rate, the price level gap would have been lower and there would have been less of a need for higher differential inflation to equalize price levels afterwards (Weyerstrass 2008).
Due to the lack of mobility of labour among eurozone countries, the Phillips curve of the eurozone is determined directly by the output gap as a measure of demand slack at the eurozone level.
Slovenia showed some signs of such movements in 2007–2009. Investment grew by 17% in 2007, and the current account deficit increased close to 5%. Gross foreign debt increased from 15 billion euro in 2004 to over 40 billion euro in 2008. GDP grew by 6.8%, which is above the potential growth rate of the last decade. Such movements on the demand side, caused by the new situation of the euro, contributed to higher inflation in Slovenia in 2007 and 2008. In 2009 the economy turned into a bust situation.
The author and Katja Zajc Kejžar carried out an extensive empirical study of the natural rate of unemployment and the Phillips curve for Slovenia based on quarterly data. It is interesting that the regression above with import prices yielded better results than with the nominal exchange rate. However, annual data yielded better results with the nominal exchange rate (Senjur and Zajc Kejžar 2009). This article focuses more on the results based on annual data. The pass-through effect of the nominal exchange rate on inflation is better reflected by annual data.
Mihaljek and Klau (2008) provide recent empirical estimates of catching-up and inflation in transition economies.
Data are taken from a publication by the Slovenian government’s Institute for Macroeconomic Analyses and Development (UMAR) titled the Poročilo o razvoju (Development Report), Ljubljana, 2009.
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Senjur, M. Differential inflation, Phillips curves, and price competitiveness in a new euro-member country. Econ Change Restruct 43, 253–273 (2010). https://doi.org/10.1007/s10644-010-9090-8
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DOI: https://doi.org/10.1007/s10644-010-9090-8