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Content: This, in theory, should be beneficial for citizens of the euro area, as increases in trade are historically one of the main driving forces of economic growth. Moreover, this would fit with the long-term purpose of a unified market within the European Union. A major benefit is the removal of bank currency transaction charges that previously was a significant cost to both individuals and businesses when changing from one currency to another. Conversely, banks will suffer a significant reduction in profits with the loss of this income. A second effect of the common European currency is that differences in prices—in particular in price levels—will decrease. Differences in prices can trigger arbitrage, e.g. trade between countries, which will equalise prices across the euro area. Often this will also result in increased competition between companies, which should help to contain inflation and which therefore will be beneficial to consumers. Some economists are concerned about the possible dangers of adopting a single currency for a large and diverse area. Because the Eurozone has a single monetary policy (and so a single interest rate), set by the ECB, it cannot be fine-tuned for the economic situation in each individual country. Public investment and fiscal policy in each country is thus the only way in which economic changes can be introduced specific to each region or nation.