It is very difficult to enter a single currency zone having fairly weak economic parameters and maintain a favourable state of the economy, not to mention positive growth rates. We have witnessed it not only in Europe, but for example in Argentina (nearly 10 years ago or more), when they tied the national currency to the dollar and later they did not know what to do about it.
There are many issues in the global economy in general and in the western economy as well: population ageing, drop in labour productivity growth rates. This is obvious. The overall demographic situation is very complicated.
