This means that, unlike in a free trade area, they cannot act alone to protect their constituents from unfair or unlawful competition from abroad. Yet such underpinning at the political level is vital for a market to function.
The procedure of converting current price estimate into constant price followed earlier, especially for estimating the output of financial sector, resulted in some kind of anomalies. In some cases, while estimate at current price was negative, constant price estimate was positive and increasing. However, in the last GDP revision (1999-00 series), this problem was corrected after a series academic discussion with CSO.