If we decide to open country, they must have an export item, such as a sheep or a ball, but if we do not have to import the machine or their labor added to help in the production of goods, it cannot produce.
If we decide to open the country would have to export products such as sheep or a ball, but if we do not import the machinery or labor to help in the production of goods. It can not be produced
If we decide to open the country must have export goods such as sheep or ball, but if we do not import the machine or extra labor to help in the production of goods. It will not be produced.