P.S. Also, it seems like I found the best trading route. I assumed uniform distibution when I calculated expected value of profit. I also prefered absolute size of profit over relative size (i.e. it's better to have huge sum of money as profit, even if rate of profit is small). Turned out that this city in Dorgania is the best route (I ignored the city where you get items in return instead of money. Yes, it's possible to sell them, but in order to be more or less sure how good this trade route is I would need to gather data about prices of bought goods. It would require me to use said trade route many times in order to collect enough statistics and I felt that it would take too much time). I ignored time needed for caravan to arrive because I would be too impatient to wait for arrival of the caravan even on shortest trade routes.
