I believe the answer is: Citizens have economic freedoms with some government regulation
In mixed economy, the resource management in country is handled by both the government and the private sectors.
This allow the citizens to have economic freedoms in choosing the type of goods or service they want to produce, but limited with government regulation in order to help the competition run more fairly.
The convoy system is the system of employing naval protection for merchants or troops. That means that the enemy who would want to damage the other side by cutting off their supplies would have to face more resistance.
This system was especially successful in the First World War, and it was said to contribute greatly to winning, as it was the German strategy to cut their enemies off from possible suplies (such as from the US).
I believe it’s to bring oxygen into the body and to remove carbon dioxide from the body
Petroleum, Jewelry, Packaged Medical Treatments, Rice, and Cars.
The oldest of these exports are Petroleum and Rice. They are still exported. You may see Jasmine Rice in grocery stores. That is exported from India.