The trading post was up for me for the first time yesterday and it provided me with an opportunity to start tracking data. My education lies in business and the business of game particularly. In as such, this kind of stuff is quite enjoyable to me. It is my hope to keep up with weekly updates on the economy in the long term. (This is my first time trying to use images in a post so please excuse my mess)
In a stable economy we would see a steady increase in prices as we move from the tier 1 items on the left to the higher tiers on the right. Guild Wars 2 however, has yet to stabilize and thus we see the results shown below. The most interesting factor to me at the moment is that copper ore and platinum ore are currently trading at the same rate (hint: sell copper ore and buy platinum ore while you can).
The logic behind this is simple, as with any economy supply and demand are the key factors. In this case demand is the one true factor. With the influx of new characters everyone is working on the same crafting skills and thus competing for the same items on the trading post. As we move forward a couple of months we should see a chart that looks something like this:
One thing to point out is the absence of the top tiered items from the above charts. Both Orichalcum Ore and Gossamer Thread are trading at a premium of 425 and 850 copper respectively. Including them on the charts would render them useless as they would dwarf the other tiers.
Update: WoW data included for reference. Many posters have already pointed out some of the reasons why long term data will not be steady and this seems to provide proof of their point. It's not all inclusive though.
Edited by NavyNoob, 05 September 2012 - 10:51 PM.