When do countries have a comparative advantage?

Countries have a comparative advantage when they can produce certain goods or services at a lower opportunity cost compared to other nations. This advantage arises from differences in resources, technology, or labor efficiencies, allowing them to specialize in the production of those goods. By focusing on what they produce most efficiently and trading with others, countries can benefit from increased overall economic output and consumption. Essentially, comparative advantage encourages international trade and specialization, leading to greater efficiency in the global economy.