That's not how most collective decision making goes though. You just make the rule and lets the costs be what they'll be. If you could omnipotently know the ind

That's not how most collective decision making goes though. You just make the rule and lets the costs be what they'll be. If you could omnipotently know the individual costs of laws people would oppose all of them -- real purchasing power is horrible right now, taking anyone's discretionary income for anything will be wildly unpopular.