What does “More Money” stack with

BP is your number of Brave Points. The number of BP you have influences your performance in battle. For me, it maxes out at 3 BP.

Certain actions naturally consume BP, and others are fueled by it explicitly (like Valkyrie Acrobatics, for instance). Some accessories and skills allow you do more damage and take less with a higher BP. Having a negative BP makes you more vulnerable in any situation.

The Brave menu command spends 1 BP to give you an extra move in battle. The Default command has you defend and you get +1 BP at the end of the turn.

If you start a turn with negative BP, you can't act. Negative BP is automatically incremented at the start of each turn.

Reactive abilities like Counter are not inhibited by negative BP.

The Sweeper counter is only increased, or lost, when you encounter parties of 2+ monsters. So, you can get to Sweeper Hero even if every other battle is a single monster battle, so long as you KO the 2+ mob parties with a single attack.