Also, there is a large concentration of larger numbers of immigrants in some already populated countries like the UK. Not all countries have the same language, which makes it difficult to find work in other countries. Likewise, the use of the Euro, regulated by the ECB as the single currency, means that interest rates are the same for the entire Zone. Another obstacle for the Eurozone is competitiveness due to the lack of devaluation. When countries have their own currency, companies can place their products where they could generate a better profit due to devaluation. Likewise, it diminishes the continued rise in workers' wages compared to economies like China's, where workers have low wages