A primary source. That would be a source coming directly from someone who was in the war so you know it is reliable and probably the most accurate. A secondary source could be from a journalist or an outside mind that doesn't know the true experience of being in the war and is just observing from an outsiders view.
The free enterprise systems allows for true competition. This is because the limited restrictions and limitations from the government allow companies to continuously pursue each-other and compete via their own strength.
