Originally Posted by Voodoo Rage
I'm actually really fascinated by the economy of this game, so if you wanted to elaborate...
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1) Items are static. With a few exceptions, nothing you acquire in the game will ever disappear. That means that the supply of any given weapon/mini/tonic will only grow over time.
2) A component of the demand for a particular good is the availability of similar goods (call them substitutes). You can witness this every year when the birthdays happen... the prices of old minis drop when new ones are released. The more options that exist, the less money players are willing to exchange for any one of them.
The combination of these two factors means that, ceteris paribus, prices in the goods market will continue to fall in the long run. However, it does get a little more complicated when you introduce the money market, particularly due to reason 1 above. With so few marginal costs associated with gameplay, platinum has a tendency to just accumulate which can cause inflationary pressure. This is why goldsinks are implemented: to help drain resources from the game.
The magnitudes of these opposed effects is what determines price.