During the course of history activities such as foreign currency exchange rates have contributed directly to the economy of a country or region specific, since this activity appears to be as regular as an activity that provides significant financial returns which contribute to the above. Changes in foreign currency can be defined as the economic value of a currency in a country other than home, which can be expressed as units of national currency of that country. This activity has been developing since the twentieth century where the importance that each country gave its currency resulted in the creation of institutions specializing in foreign exchange, also called moneychangers. Currency exchange offices are entities created for the purpose of facilitating the entry and exchange of foreign currency to home currency, these homes are exposed to determine the value of foreign currency by two exchange rate systems, they are. Fixed exchange rate: this is the value that is given to foreign exchange currency specifically given national central bank of each country. flexible exchange rate or floating: the exchange rate determines the value of foreign currency through the interplay of supply and demand. It is important to note that the value of a foreign currency not only bases its value in the determination of each country, but this value also affects the country's economic activity abroad and the same production capacity.
Changes in foreign currency have certain qualities very beneficial to the public, some of these qualities as: Change spot: this attribute allows the foreign currency exchange is made immediately, making cash by providing immediate liquidity. Changing the future: this is an activity especially banking, which is based on offering customers the ability to save foreign currency capital we have, in order that this can be changed in the future when the currency gain more economic value. It is worth mentioning that this activity can be risky because currency can raise or lower the price over time. It is essential to note that the activities of foreign exchange, are subject to various regulatory laws determined by each government. These laws specialize in determining the amounts of foreign money coming into circulation in a country for every person, thanks to the existence of an exchange rate maximum per person, which helps prevent the appearance of certain professional activities like money laundering . Currently there are market currencies like the dollar and the euro that can be changed anywhere in the world, they are the currencies that are economically more balanced, but any currency can be exchanged for local currency, provided they are previously valued in dollars or euros.