The markets in this game are controlled by two things: supply/demand and game description of what is fair.
Supply/demand works just like any market and sometimes the local supply is of some good is short, sometime not. The thing is, only you can determine what it's worth to you. So if you are catering something and need silk, "right now!," it's going to be worth a lot more scrolls or crystal (or anything else you can trade it for), "right now!" than it will be tomorrow. That's the nature of human perception and the "intangibles" (like not wanting to wait) cause us to adjust our offers.
So you have a bunch of scrolls and nobody seems to want them...you either try for a different city boosted in something other than scrolls, but that is only a temporary solution (see below), you cut back on scrolls production and use the space for your other two boosts (and then trade them for crystal or silk, if you can), or you increase your scrolls to balance the overall value of your scrolls (effectively producing the same value you would in scrolls if you were boosted in silk or crystal instead). The point it, whatever you produce you need to produce enough or gain enough through trading to meet your needs as a city. If you are in a fellowship that restricts the types of trades you can make, you have less options to accomplish this. That's the other way to evaluate the value of your goods.
The other option is to go along and believe that when the trader says scrolls are equal in value to crystal or silk and it is "fair" when you trade equal scrolls for equal crystal or silk. You know from experience how that works. And that's the problem in a nutshell. Many players believe the value of goods is what the game says it is, when, in fact, it depends on the value a player assigns to it in their circumstances. Sadly, many fellowships follow this and will restrict your trading and insist you go by the somewhat artificial valuations of the game. When therefore, you get larger (some leeway is usually permitted smaller players), you may find your fellowship won't allow you to post any zero or one star trades without permission AND/OR won't allow you to do cross tier trading -- meaning the "T1" goods (planks, marble, steel) for either "T2" (crystal, scrolls, silk) or "T3" goods (elixer, dust, gems), or some other movement of goods for something outside their "T" (tier). It's my belief these "rules" are harmful to many players but the community has used them so long that nobody, or few of us, have questioned/challenged the status quo. (It takes a lot of moxy to challenge the "status quo" doesn't it? LOL).
So, my recommendation is to adjust rather than start over. Because the game does fluctuate and the fluctuations can go on for months. When that happens you will need to see things more clearly and adjust to current and real in-game market conditions, rather than continue following game suggested and inaccurate game valuations of you goods. And if you are in a fellowship that insists you restrict the types of trading you do, leave and find a an Open Trading fellowship.
AJ