Merece la pena leer esta columna de Milton Friedman sobre el euro de 1997.
No puedo resistir la tentación de citar parte de la misma:
"A common currency is an excellent monetary arrangement under some circumstances, a poor monetary arrangement under others. Whether it is good or bad depends primarily on the adjustment mechanisms that are available to absorb the economic shocks and dislocations that impinge on the various entities that are considering a common currency. Flexible exchange rates are a powerful adjustment mechanism for shocks that affect the entities differently. It is worth dispensing with this mechanism to gain the advantage of lower transaction costs and external discipline only if there are adequate alternative adjustment mechanisms."
"The United States is an example of a situation that is favorable to a common currency...Europe’s common market exemplifies a situation that is unfavorable to a common currency."
Pero lo mejor viene al final:
"The drive for the Euro has been motivated by politics not economics. The aim has been to link Germany and France so closely as to make a future European war impossible, and to set the stage for a federal United States of Europe. I believe that adoption of the Euro would have the opposite effect. It would exacerbate political tensions by converting divergent shocks that could have been readily accommodated by exchange rate changes into divisive political issues. Political unity can pave the way for monetary unity. Monetary unity imposed under unfavorable conditions will prove a barrier to the achievement of political unity."