If by "the rules of the system", you mean the idea that things are worth what people will voluntarily pay for them, then I agree with your definition. But that's not tautological. It is a distributed price-setting process that everyone contributes to through their own economic choices.
When it comes to charity, people contribute time and money based on their perceived impact. As a donor, I would value 100 new houses higher than 10 new houses, but that's just me. Other people are free to make different choices.