Oh, and in case you were wondering, isn't something like witness discount similar? The answer is a resounding no! Think about it - what the witness discount controls is *how much stuff can go into a block* and is therefore a *global* consensus rule. If miners break it they fork off. Here what the ZIP is discussing is having everyone sing kumbaya and agree what kinds of fees are fair, reasonable and keep good privacy and ddos resistance for everyone. It'll work fine, until it doesn't.