However, the basic factor that will determine the importance of the euro as a widely used currency in the world economy, in addition to the demographic, economic and financial dimensions of the euro area, is, without a doubt, the stability of the new currency, understood as a means to maintain the purchasing power of savings. Stability is the basic requirement for a good currency. It is what we at the ECB want for the euro. We want a stable euro and we are convinced that, in the long term, the euro will derive strength from its stability. The stability of the euro is the basis for the confidence in and the credibility of the ECB, without which a large international role for the euro would be unthinkable.
Stability is the proof of the effectiveness of the institution.
Yet in order to be credible it is not sufficient for the ECB to maintain stability. These parameters or conditions for the credibility of the euro are certainly demanding. However, the achievement of these conditions is the aim of all those of us who have responsibilities with regard to the functioning of the Eurosystem. The second factor, which we have called the large size factor or the habitat of the euro, is important because without a certain critical mass, a currency cannot have international relevance, however high its degree of stability. The figures relating to the population and the GDP of the euro area illustrate this.