Optimum currency area

In economics, the theory of optimum currency area (OCA), also known as an optimal currency region (OCR), is a geographical region in which it would maximize economic efficiency to have the entire region share a single currency.

It describes the optimal characteristics for the merger of currencies or the creation of a new currency. The theory is used often to argue whether or not a certain region is ready to become a currency union, one of the final stages in economic integration.

An optimal currency area is often larger than a country. For instance, part of the rationale behind the creation of the euro is that the individual countries of Europe do not each form an optimal currency area, but that Europe as a whole does form an optimal currency area.[1] The creation of the euro is often cited because it provides the most modern and largest-scale case study of an attempt to engineer an optimum currency area, and provides a comparative before-and-after model by which to test the principles of the theory.

In theory, an optimal currency area could also be smaller than a country. Some economists have argued that the United States, for example, has some regions that do not fit into an optimal currency area with the rest of the country.[2]

The theory of the optimal currency area was pioneered by economist Robert Mundell.[3][4] Credit often goes to Mundell as the originator of the idea, but others point to earlier work done in the area by Abba Lerner.[5]


OCA with stationary expectations

Published by Mundell in 1961, this is the most cited by economists. Here asymmetric shocks are considered to undermine the real economy, so if they are too important and cannot be controlled, a regime with floating exchange rates is considered better, because the global monetary policy (interest rates) will not be fine tuned for the particular situation of each constituent region.

The four often cited criteria for a successful currency union are:[6]

Additional criteria suggested are:[9]

European Union

Europe exemplifies a situation unfavourable to a common currency. It is composed of separate nations, speaking different languages, with different customs, and having citizens feeling far greater loyalty and attachment to their own country than to a common market or to the idea of Europe.
Milton Friedman, The Times, November 19, 1997"

theory has been most frequently applied in recent years to discussions of the euro and the European Union. Many have argued that the EU did not actually meet the criteria for an OCA at the time the euro was adopted, and attribute the Eurozone's economic difficulties in part to continued failure to do so.[10][11] While Europe scores well on some of the measures characterising an OCA such as symmetry of shocks. By looking at the correlation of a region's GDP growth rate with that of the entire zone, the Eurozone countries show slightly greater correlations compared to the U.S. states. However, it has lower labour mobility than the United States, possibly due to language and cultural differences. In O'Rourke's paper, more than 40% of U.S. residents were born outside the state in which they live. In the Eurozone, only 14% people were born in a different country than the one in which they live. In fact, the U.S. economy was approaching a single labor market in the nineteenth century. However, for most parts of the Eurozone, such levels of labour mobility and labor market integration remain a distant prospect.[12] Furthermore, the U.S. economy, with a central federal fiscal authority, has stabilization transfers. When a state in the U.S. is in recession, every $1 drop in that state’s GDP would have an offsetting transfer of 28 cents.[13] Such stabilizing transfers are not present in both the Eurozone and EU; thus, they cannot rely on fiscal federalism to smooth out regional economic disturbances. The European crisis, however, may be pushing the EU towards more federal powers in fiscal policy.[14]

United States

Kouparitsas considered the United States as divided into the eight regions of the Bureau of Economic Analysis, which are Far West, Rocky Mountain, Plains, Great Lakes, Mideast, New England, Southwest, and Southeast.[15] By developing a statistical model, he found that five of the eight regions of the country satisfied Mundell's criteria to form a single Optimal Currency Area.[16] However, he found the fit of the Southeast and Southwest to be questionable. He also found that the Plains would not fit into an optimal currency area.

OCA with international risk sharing

Here Mundell tries to model how exchange rate uncertainty will interfere with the economy; this model is less often cited (publication in 1973).

Supposing that the currency is managed properly, the larger the area, the better. In contrast with the previous model, asymmetric shocks are not considered to undermine the common currency because of the existence of the common currency. This spreads the shocks in the area because all regions share claims on each other in the same currency and can use them for dampening the shock, while in a flexible exchange rate regime, the cost will be concentrated on the individual regions, since the devaluation will reduce its buying power. So despite a less fine tuned monetary policy the real economy should do better.

A harvest failure, strikes, or war, in one of the countries causes a loss of real income, but the use of a common currency (or foreign exchange reserves) allows the country to run down its currency holdings and cushion the impact of the loss, drawing on the resources of the other country until the cost of the adjustment has been efficiently spread over the future. If, on the other hand, the two countries use separate monies with flexible exchange rates, the whole loss has to be borne alone; the common currency cannot serve as a shock absorber for the nation as a whole except insofar as the dumping of inconvertible currencies on foreign markets attracts a speculative capital inflow in favor of the depreciating currency.
Mundell, 1973, Uncommon Arguments for Common Currencies p. 115

Mundell's work can be cited on both sides of the debate about the euro. Most economists cite preferentially the first (stationary expectations) model, and conclude against the optimality of the euro. However, in 1973 Mundell himself constructed an argument on the basis of the second model that was more favorable to the concept of a (then-hypothetical) shared European currency.

Rather than moving toward more flexibility in exchange rates within Europe the economic arguments suggest less flexibility and a closer integration of capital markets. These economic arguments are supported by social arguments as well. On every occasion when a social disturbance leads to the threat of a strike, and the strike to an increase in wages unjustified by increases in productivity and thence to devaluation, the national currency becomes threatened. Long-run costs for the nation as a whole are bartered away by governments for what they presume to be short-run political benefits. If instead, the European currencies were bound together disturbances in the country would be cushioned, with the shock weakened by capital movements.
Robert Mundell, 1973, A Plan for a European Currency pp. 147 and 150



The notion of a currency that does not accord with a state, specifically one larger than a state – formally, of an international monetary authority without a corresponding fiscal authority – has been criticized by Keynesian and Post-Keynesian economists, who emphasize the role of deficit spending by a government (formally, fiscal authority) in the running of an economy, and consider using an international currency without fiscal authority to be a loss of "monetary sovereignty".

Specifically, Keynesian economists argue that fiscal stimulus in the form of deficit spending is the most powerful method of fighting unemployment during a liquidity trap. Such stimulus may not be possible if states in a monetary union are not allowed to run sufficient deficits. The Post-Keynesian theory of Neo-Chartalism holds that government deficit spending creates money, that ability to print money is fundamental to a state's ability to command resources, and that "money and monetary policy are intricately linked to political sovereignty and fiscal authority".[17] Both of these critiques consider the transactional benefits of a shared currency to be minor compared to these drawbacks, and more generally place less emphasis on the transactional function of money (a medium of exchange) and greater emphasis on its use as a unit of account.

Self-fulfilling argument

In Mundell’s first model, countries regard all of the conditions as given, and assuming they have adequate information, they can then judge whether the costs of forming a currency union outweigh the benefits. However, another school of thought argues that some of the OCA criteria are not given and fixed, but rather they are economic outcomes (i.e., endogenous) determined by the creation of the currency union itself. This leads to the question that, even if the Eurozone isn’t an OCA now, by adopting a common currency, it might become an OCA in the future.

Consider good market interaction as an example: if the OCA criteria were applied before the currency union forms, then many countries might exhibit low trade volumes and low market integration; which means that OCA criteria are not met. Thus, the currency union might not be formed based on those current characteristics. However, if the currency union was established anyway, its member-states would trade so much more that, in the end, the OCA criteria would be met. This logic suggests that the OCA criteria can be self-fulfilling. Furthermore, greater integration under the OCA project might also improve other OCA criteria. For example, if goods markets are better connected, shocks will be more rapidly transmitted within the OCA and will be felt more symmetrically. Thus, creating the Eurozone will not only boost trade volume, but also increases the symmetry of shocks. Subsequently, this process further ensures that the Eurozone meet the OCA criteria.

However, caution should be employed when analysing the self-fulfilling argument. Firstly, the self-fulfilling effect's impact may not be significant. According to a recent study by Richard Baldwin, a trade economist at the Graduate Institute of International Studies in Geneva, the boost to trade within the Eurozone from the single currency is much smaller: between 5% and 15%, with a best estimate of 9%.[18]

The second counter-argument is that further goods market integration might also lead to more specialization in production. Once individual firms can easily serve the whole OCA market, and not just their national market, they will exploit economies of scale and concentrate production. Some sectors in the OCA might end up becoming concentrated in a few locations. The United States is a good example: financial services are centered in New York City, entertainment in Los Angeles, and technology in Silicon Valley. If specialization increases, each country will be less diversified and will face more asymmetric shocks; weakening the case for the self-fulfilling OCA argument.[19]

See also


  1. Baldwin, Richard; Wyplosz, Charles (2004). The Economics of European Integration. New York: McGraw Hill. ISBN 0-07-710394-7.
  2. Federal Reserve Bank of Chicago, Is the United States an optimum currency area?, December 2001
  3. Mundell, R. A. (1961). "A Theory of Optimum Currency Areas". American Economic Review. 51 (4): 657–665. JSTOR 1812792.
  4. Coy, Peter (October 25, 1999). "Why Mundell Won the Nobel: For work that led to the euro, not for his supply-side theory". BusinessWeek.
  5. Scitovsky, Tibor (1984). "Lerner's Contribution to Economics". Journal of Economic Literature. 22 (4): 1547–1571 [see pp. 1555–6 for discussion of OCA]. JSTOR 2725381.
  6. Frankel, Jeffrey A. & Rose, Andrew K. (1997). "The Endogenity of the Optimum Currency Area Criteria" (PDF). The Economic Journal. 108 (449): 1009–1025. doi:10.1111/1468-0297.00327.
  7. Baldwin, Richard (2006). In or Out: Does it Matter? An Evidence-Based Analysis of the Euro's Trade Effects (PDF). London: Centre for Economic Policy Research. ISBN 1-898128-91-X.
  8. "Greece Takes Bailout, but Doubts for Region Persist". New York Times. May 3, 2010.
  9. van Marrewijk, Charles; Ottens, Daniël; Schueller, Stephan (2006). International economics: theory, application, and policy. Oxford, UK: Oxford University Press. p. 620. ISBN 0-19-928098-3.
  10. Ricci, Luca A. (March 2008). "A model of an optimum currency area". Economics: the Open-Access, Open-Assessment E-Journal. Budapest Open Access Initiative. 2 (8): 1–31. doi:10.5018/economics-ejournal.ja.2008-8.
  11. Krugman, Paul (19 July 2015). "The Euroskeptic Vindication (blog)". Paul Krugman. Retrieved 24 July 2015.
  12. O’Rourke, Kevin (Summer 2013). "Cross of Euros". Journal of Economic Perspectives. Retrieved 29 April 2016.
  13. O’Rourke, Kevin (Summer 2013). "Cross of Euros". Journal of Economic Perspectives. Retrieved 29 April 2016.
  14. Caporaso, James A.; Kim, Min–hyung; Durrett, Warren N.; Wesley, Richard B. (August 2015). "Still a regulatory state? The European Union and the financial crisis". Journal of European Public Policy. Taylor and Francis. 22 (7): 889–907. doi:10.1080/13501763.2014.988638.
  15. See map of regions
  16. Kouparitsas, Michael A. (2001). "Is the United States an optimum currency area? An empirical analysis of regional business cycles" (PDF). Federal Reserve Bank of Chicago Working Paper. 2001-21.
  17. Goodhart, Charles A.E. (August 1998). "The two concepts of money: implications for the analysis of optimal currency areas". European Journal of Political Economy. Elsevier. 14 (3): 407–432. doi:10.1016/S0176-2680(98)00015-9. Pdf.
    See also: Wray, L. Randall (July 2000). "The Neo-Chartalist Approach to Money" (Working Paper No. 10). Center for Full Employment and Price Stability.
  18. Richard Baldwin, In or Out: Does It Matter? An Evidence-Based Analysis of the Euro’s Trade Effects (London: Centre for Economic Policy Research, 2006)
  19. Feenstra, Robert C., and Alan M. Taylor. "Chapter 10." International Macroeconomics. New York: Worth, 2014. 412-14. Print.
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