*sigh*
Here I am, making FA badge charts for y'all on my Saturday, in between tourneying and eventing, and geez!
First thing this morning, after a VERY long week that I hope I will not be repeating any time soon, I did make a remark, about how a great many low level cities place buildings that have been designed to produce goods for higher chapters. And for many players, these buildings produce tier 3 goods. Yes, they get placed to produce extra supplies or whatever, but they tend to get stalled at tier 3 goods as a city evolves. I have a couple of cities with Moonstone Library pieces that end up stuck making T3 because it's too handy to upgrade right off. I also recall having a LOT of tier 3 at that point, yes, with the Jester's set and Snow Owl sets at chapters 7 and 8. I did NOT trade away my glut of tier 3 but instead saved a bunch of resources placed elsewhere, in terms of less tier3 factories. But I am not the average player.
I will repeat what I said earlier: Build, or better yet, keep what you need, and NOT what you don't. You have too much tier 3? and not enough tier 2? Store something that makes tier 3 and replace it with something that makes what you need. (Not speaking specifically to Ashrem or Enevhar, either at this point).
I routinely avoid cross tier trades. It's reached a point that I never take these trades, excepting wee trades from small neighbors, where I don't much notice giving them what they're requesting. I mean, we don't even see amounts in the hundreds, and it's getting to where we don't even see amounts in the thousands, when our goods total in the millions or billions, due to rounding. How often do I look at wee neighbors' trades? about twice a month maybe.