How to fix trading, without adding trading in game
I am guessing the price limit on items is an attempt to prevent lower to mid range level players from being gated from content. The problem with that is that those same people are hindered by these price limits in their advancement. Sometimes a player will facilitate this by spending diamonds on tom and selling rings on the market for coins. I doubt however this was an intended purpose.
This is however why we rarely see anything beyond wheat, corn, wool, shirts, hats, bacon, eggs, and the crafted eggs and bacon in the paper. If there were no price limits, we would see mid level players putting more cheese up. We would see more bems and sems as well. The simple fact is the max price limits do not accurately reflect the relative worth or demand. It is because of this that people look to trade items to get what they want. The high level players, having gone months with no new content, want to cap that bnb and want to do it now. Instead of sitting on that million coins thathigh level player can buy that high demand tem (paint or map).
there is no risk of pricing mid level players out of the tem market on the paper because, quick frankly, there is no tem market on the paper now. All the expansion items shouldn't be limited to getting on the paper by people that dont know any better.
i like this game because it is for the most part an economic sandbox game. There are ways to get around the limitations that make hay day not have a free market but they aren't supported by sc. Removing or adjusting price caps periodically would do it.