The game is a 'light' simulation in a sense that it's not based on a complicated economic model, and there are far less variables at work here than, say, Holistic Design's Machiavelli The Prince. Similar to Sid Meier's Railroad Tycoon, you can 'retire' whenever you wish, at which point you will be given a score based on your wealth and prestige. Since Marco Polo is an economics simulation, albeit a historical one, there are no 'victory conditions' to fulfill. As the title implies, your goal is to emulate Marco Polo, legendary explorer and merchant who helped make the 'Silk Road' one of the most important trading routes in history. By buying low and selling high and completing missions entrusted to you by the various characters that you encounter throughout the game, you gain fame and fortune.
Set in Asia during the Middle Ages, you play the role of an aspiring merchant in I-Motion's Marco Polo, one of the most obscure games from the company.