From the article:
In Rising Sun, money plays a huge role. Whether you’re winning or losing a battle, it’s going to cost you. However, when war does break out, players can freely negotiate, or even bribe each other to find a scenario that works for all parties. A wise warrior finds the solution that will cause the least bloodshed and cost the least amount of money. It’s great when a deal can be struck, but if that deal seems too good to be true, players should question if they can really trust their opponent to hold up their end of the bargain.