A demand of the people in each country wanted something exotic rounded what country itself, so there is no need for international trade ต้แง have occurred.
The needs of people in each country, it would be something exotic rounded the country itself is not. Therefore it is necessary that the terms of trade has occurred.
Product requirements of people in each country also want something new with what the country itself is no. Therefore, it is necessary at the low water แงมี international trade happened.