Again, are you sure?
I have not seen anything like that, but if you have some sort of proof Ill happily jump on the wagon.
I have not seen anything like an economy at all , but it is hard to be 100% sure as my speechcraft and other skills rise, so that would affect a scaled system.
I have not seen the Riverwood merchant stock daedric while the Karwasten one is still on ebony, for example.
On the contrary, the rare times I go to places I rarely go, they have the exact same stuff as my main base.
I just did a test by fast travelling to every hold to check the price of my gear. It was expensive gear, so that a difference of less than 1% would be noticed. I compared it to all the different vendors in every hold, and then compared it to my "regular" shops where I've sold thousand upon thousand of dollars of things.
No current difference. Everybody had the exact same number on every single thing, including gems, potions, and enchanted armor/weapons. So, it would appear to me that reputation does not have any influence on the price.
The next thing to test would be whether or not selling a ton of items moves the price at all. That will be hard to test, though, because Iron daggers are only worth 4 gold. The price would have to shift by at least 25% before you would see a difference of even 1 gold anywhere. Due to that, I think I'm going to try selling some more expensive jewelrey, and just use the console to give the venders tons of money.
I'll do that one in the mornin'. Time to sleep now.