If you are planning to set up a small business which involves dealing with people in a different country, you should be very careful about the exchange rate of the dollar and of the currency of the country that you are going to deal with. For instance, if the  small business  that you are planning involves working with German business men, you need to know what the exchange rate of the Deutschemark is when compared with the American dollar. Unless you are careful about this the small business that you have planned might run into trouble.