Countries decide what to export and import depending on the necessity and current trade levels. Countries participate with others in trades to benefit from each other in this mutualism. Countries decide what to export depending on the need and popularity of a product in another country. This needs to be reevaluated constantly, so they can continue making money, and that the trade generates revenue. Exportation and importation is highly influenced by government policies, and by availability of a product. Many countries limit their imports, encouraging consumers to purchase from the country's own stock, benefiting the countries individual economy. Importing is done to receive products that are not easily acquired in the country where they reside in. Trade needs to be balanced, and continuously happening, otherwise, friendly relations, due to benefiting the other's economy, could turn sour.
