I think this might lead to market crises, but at least that'll be entirely up to the players.
In fact, I think this way makes much more sense than in the previous strategus.
From what I understood, all the basic resource transactions won't need gold. I think (roughly) it'll be that you apply labour (players and time) to fiefs, and you get resources and tickets. Resources can then be made into equipment (I think through more labour).
So as long as the trade system isn't gold based (i.e. you can trade labour, resources, equipment etc as well as gold), you've got a barter based economy with currency on top.
Then, gold has (as chadz said) whatever value people give it. It should be a lot of fun seeing what happens. In itself gold will be worthless, since you can't produce anything with it. But I wonder how the system will evolve, maybe we'll see a gold standard established. Maybe we'll see the evolution of a currency based economy and even credit.
A situation where cRPG grind gold becomes influential in strategus, and any resulting situation of market crisis, would only be the fault of players.
Sounds like fun