Answer:
Countries specialize in areas that they are naturally good at and also benefit from increasing returns to scale for the production of these goods. They benefit from economies of scale , which means that the average cost of producing the good falls (to a certain point) because more goods are being produced. Similarly, countries can benefit from increased learning. They simply are more skilled at making the product because they have specialized in it. These effects both contribute to increased overall efficiency for countries. Countries become better at making the product they specialize in. Trade is central to ending global poverty. Countries that are open to international trade tend to grow faster, innovate, improve productivity and provide higher income and more opportunities to their people. Open trade also benefits lower-income households by offering consumers more affordable goods and services.