Like every other product the coin of a country has a price, which is the exchange type; this represents the quantity of Mexican pesos that are needed to buy an American dollar, and like every other price this one is determined because: a) Because of the offer and demand of dollars, or b) Because of the monetary authorities of the country. The origin of the exchange types comes from the necessity that residents of one country have to buy another country's money in order to cover their international debts. In Mexico's case, residents demand dol ....