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This year it has been twenty years since the introduction of the euro on the financial markets following the fixing the cross-exchange rates of the currencies of founding eurozone countries. For some, this step as of 1 January 1999 meant a reason for celebration as the formation of eurozone was the milestone towards the accomplishment of the so-called European project. To others, it presents the opportunity to ponder the economic viability and sustainability of the euro-zone area going forward. This is because the sheer construction of this currency area implies many risks and the sustainability of this monetary construct is not beyond doubt.

The Mundell’s theory of optimal currency area was supposed to justify the euro-zone project. However, whether the eurozone as now constructed, which includes the peripheral South as well as some countries of the converging East , is such area is not without a question. This blog argues that with such degree of heterogeneity, as it is now present in the Eurozone, and – by definition of the monetary area – a lack of adjustment via cross nominal exchange rates in the euro area, we would be lucky if that by now significant dis-equilibria would not appear in the countries of this currency area.

First, to be fair if little speculatively, a brief comment on (im)possibility of installing equilibria in many-countries-world, the case of the flexible exchange rate regime notwithstanding. In a hypothetical world with two countries and two currencies at least in principle it should be possible to achieve equilibria in these two countries – flexible nominal exchange rate should arrive at the level such that both countries have achieved internal and external equilibria. This, in theory, could be achieved very fast or even instantaneously by the movement of the nominal exchange rate between two currencies. However, what happens if there are three, four, five or many more countries as it is the case in the real world ? Does a set of cross-exchange rates equilibrate these economies in the world in which we live ? It seems to the author that, given this complexity, even in the world of flexible exchange rates it might be difficult to achieve equilibria in all countries. This is because there are too many variables – and relations among them – at play. Furthermore, some are fixed or slow-moving in the short-term. However, adjustment towards the equilibrium in an individual country can be fast in the world of flexible exchange rates.

In order to see the issue of dis/equilibria more clearly, let’s remind ourselves of the concept of real effective exchange rate (REER). It is constructed as the nominal effective exchange rate i.e. trade-weighted exchange rates against currencies of trading partners adjusted for a trade-weighted differential of price inflation. Empirically, the inflation index to be used can be CPI (consumer price index), PPI (producer price index) or ULC (unit labor costs). Such REER can then be a useful indicator of competitiveness or existing imbalances, especially if compared with some equilibrium yardstick.

Of course, cross nominal exchange rates in eurozone countries were eliminated as their currencies ceased to exist when the countries formed the currency block. However, does this mean that we should cease to track the respective real effective exchange rates of the eurozone countries ? Of course not – they continue to be a useful concept. There still is a substantial room for variation of REERs of eurozone countries because a) there exists an inflation differential between individual eurozone countries and trading partners whether eurozone members or other countries; b) eurozone countries trade with non-eurozone countries ( portfolio of trading partners differs in each country) and the nominal exchange rates of euro vis-a-vis those countries can adjust; c) trade weights change over time too.

Hence – given that the eurozone is far from homogeneous and fully synchronized entity (think about the South or East) and because of the effect of non-eurozone countries on REERs – real effective exchange rates of individual eurozone countries could follow various paths and possibly diverge widely from where they were at the onset of the euro (and their equilibrium trajectories). Therefore, after twenty years of its inception and a lack of cross nominal exchange rates among eurozone countries, we might be in the world where REERs are far from equilibrium in many a eurozone country. These REERs trajectories and their divergence from equilibrium paths may represent the fault lines of this monetary area. The only question now is how far from equilibrium we are in the individual countries. Of course, the most significant challenge is that under the euro regime i.e. with no possibility of nominal exchange rate adjustment on an individual basis – redress towards the equilibrium might be protracted and in some cases very painful.

Here, some additional economic research could help further shed light on issues. By using a suitable equilibrium framework – be that some form of FEER ( fundamental equilibrium exchange rate) or BEER (behavioral equilibrium exchange rate) which are known in the literature – one could quantitatively gauge the extent of the current imbalances in individual eurozone member economies. Given that fast redress via own currency movement is foreclosed – since individual currencies of eurozone countries no longer exist – certain countries could be stuck far from equilibrium. The additional research on REERs in the eurozone could further ignite thinking how to eliminate or at least reduce imbalances under constraints present within the current euro-zone construct and engineer the paths closer to the equilibria in the most efficient and socially least costly ways.

Vladimir Zlacky

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