Especially the former, is the most important. The amount of supplies consumed in warfare is simply astronomical.
Consider the battle at Steel Wing Star, for instance. The consumption of various types of ammunition was outrageous. Taking Yelisia's cruiser Quintet as an example, a single full-force volley would fire hundreds of Scalpel Missiles, twenty Heat Hammer Macro Cannons, and two Loyal Rage Macro Cannons, totaling up to a cost of 210,000 Tax Currency just for the ammunition.
The other cruisers cost about the same.
After the battle at Steel Wing Star, just the ammunition, light spears, and missiles used by the seven cruisers came to over twenty million Tax Currency; the rest of the ships would probably add up to another thirty to forty million.