Labour-Intensive Goods: Textiles, Electronics, Apparel, Toys, and Sporting Goods
Land-Intensive Goods: Beef, Wool and Meat, Vegetables
Capital-Intensive Goods: Airplanes, Automobiles, Agricultural Equipment, Machinery & Chemicals
As national economies evolve, the size and quality of their labour forces may change, the volume and composition of their capital stock may shift, new technologies may develop an even the quality of land and the quantity of natural resources may be altered.
As such changes take place, the relative efficiency with which a nation can produce specific goods will also change. As economists would say, comparative advantage can and does sometimes change