Why not just have a totally PC-based economy? A PC isn't going to buy more than one or two toothpicks from player X, and then player X has a bunch of toothpicks he can't do anything with. Supply is capped by demand. As long as retaining remains realistic (you can't just hoard food or other one-use items without some sort of rotability, and there's a limit to how much stuff a PC can hold/store), the economy balances itself, for the most part.
The only issues I can see offhand are of player on-times and making sure all professions are represented.
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