Railroad tycoon 3 had such a nice price system, where each kind of goods had a price at each point on the map, and that price changed depending on supply (inclu

Railroad tycoon 3 had such a nice price system, where each kind of goods had a price at each point on the map, and that price changed depending on supply (including deliveries) and demand. Goods could even move short distances by itself (spreading out over consuming towns, for example). So while the game was a transportation game, it was also a game of arbitrage and efficiency. You could buy industries, and setting up multi level production chains could be very profitable.