Because each country has different resources so must have the same Exchange happened export a lot. It affects the income of the population requirement causes to buy more and more help in developing country. .
Since each country has different resources. needs to be exchanged between the parties occurred. , sending out a large number It affects income. makes it want to buy more. And assist in the development
Because each country has different resources therefore shall be exchanged between incurred export a lot. It affects the income of population demand caused more and more, and help developing countries .