The colors correspond to GDP per square kilometer, with the lowest GDP yellow and red the highest GDP. The large yellow areas that we see in Canada and Australia, developed country, corresponding to unpopulated areas or a low population density.
The main tourist area is Europe because of the many cities, Mediterranean beaches, and Practical possibility of winter sports. Secondly if located in North America. In the last three decades increased the attractiveness of certain regions desenvolvidas than before, as the Caribbean, India, southeast adiático or China.
Trade is an important factor in the country's economy and improved a lot over the años.Además the World Trade Organization agreement was concluded between countries and facilitate international trade by removing trade barriers