Why do countries sometimes trade goods with one another. What about the advantages and disadvantages of trade. If one country can produce goods better than another country why would it still trade with that country? How do Tariff's impact trade. Why do some countries decide to protect certain goods and products and encourage domestic production of those items rather than see them being traded for even if another country can produce the item more efficiently. In a home country what products and industries would require tariffs on to protect domestic industries and supplies from international trade partners.