i was just thinking about this, why don't you put a "black market" in kapilands, like a market with no charge, but with chance to loose you ritem if the police come...
for ex :
I sell steel in the black market at 134 (less than in the real market) so i would made a "greater" benefit and people who want to buy this can have it for less money
but i have a "chance" to be caught by the poilce (lets say 1/3) if i'm a seller OR a buyer (with a price to pay for this "bad" trading
)this way both market will work fine :
normal market would still have the same (or nearly same) value, because some people can be afraid to be caught by the police in the black market
black market will have lower price (but not lowest than market -10% i think, or where is the benefit to sell it in the black market ??
)let me know what you think about it