Some can discuss and argue about “who” and “how” recognize “good act” vs “bad act” and this is another story which has proper answer as well. In short, I can address it, by referring to “justness” and “fairness” in a “real” decentralized system. But for now just imagine we have a perfect (or almost perfect) system that can evaluate your work (what ever work you do daily) and returns a number as usefulness index. The usefulness index represents the fact that how much useful was your job for society, or even better how much useful was your job for whole glob – since we have just one earth and we have to consider the fact that “someones benefit can be someone else lost”-. The system results your 8 hour day job in this new “value system” worth X amount of money, so you earn X coins today. In this system you prefer to follow rule as possible as in order to get higher rate. We have assumed system works enough good and evaluates your job fairly. You can not cheat system in order to earn more money, so you will decide to follow rules and act like a good actor. Not only you but all other investigate the trade-off and decide to act like a good actor.
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