It's interesting to see how much control the devs have over the economy simply by regulating the value of gold.
It's because Gold is the biggest influx of raw trias into the economy from nothing. No gold, no trias flowing in at an insane rate a day. It's easily and reliably gained, and makes trias from nothing. Since there isn't something exactly like it from a different source (farming, cooking, etc. will change this, but right now it's just gold--weapon drops true, but they aren't consistent and many are sold between players, never going into an NPC's hands), it's the one of a kind major influx of cash. And you know how some Government regulation of economies is done? By putting less new money into circulation (among other things, like changing the interest rate and the like). Regulating the value of gold puts less new money into circulation, and putting less money into circulation regulates the economy. The opposite is also true.
(Also, Gold is NECESSARY by far to keep the economy stable, but right now I think it's starting the economy towards inflation instead of balance--money goes out from training, which is a huge money sink in this game, but more money, afaik, comes in through gold mining so that we are rich while having maxed stats

)