Final answer:
The research that led to the development of the theory of national competitive advantage determined factors such as comparative advantage, national security, and national identity.
Step-by-step explanation:
The research that led to the development of the theory of national competitive advantage determined several factors. One of these factors is the concept of comparative advantage, where a country can produce a particular good or service in a more cost-effective manner than another country. Another factor is the consideration of national security, where a country may restrict trade on imported products to protect an industry that is important for national security. Lastly, the production of a particular good as a key component of national identity also plays a role in determining national competitive advantage.