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You might have serious problems with cheaters. If you can sell goods for any price, they will create many accounts to feed the primary one. You need trading mechanics that will prevent this somehow.As for medieval game, I would go for adventure/trade type. Like focus on travelling between cities with random events on the way. Merchants back then had a very different life than today traders Adding politics and prestige would be nice too (check Patrician and Merchant Prince)I would discard the stock exchange, it does not fit the theme.
you should try Kapilandshttp://www.kapilands.com/to get some inspiration & stuff
I played it, but then stopped because I was not in mood to click 50 times every day the same procedure