The 10% stacks additively, each time you do the deal, this status is applied to a different 10%. If you sacrifice 10 fingers, the entire world is guaranteed basic human needs (food, water, shelter, clothing, healthcate, etc…)
Nobody knows you saved them. Would you do it?
If everyone knows about the fact that you can do this deal, would that change your mind?
Completely random. A quantum-dice roll, impossible to predict. If they were already rich, it just means that if they go bankrupt, they still have their safety-net, they just lose all their luxury stuff. But they don’t notice any change if their basic needs are already met.
Losing 10 fingers would guarantee the status effect applied to everyone.
Then it’s not completely random though. Random would mean there’s a non-zero chance the same 10% get picked for every finger sacrificed.
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