According to the developer, "Drug Lord 2 is a game that continues where Drug Lord 1 left off. Your goal is still to amass as much money as possible by buying and selling drugs, but your neighborhood has grown considerably." Drug Lord 2 introduces an array of fun new features, namely the ability to travel between cities whose markets may be different, the borrowing of money from loan sharks, and charts displaying a history of price for each market.
The concept of the game is simple; you start off as a wannabe-drug dealer and must work your way up the ranks by making wise economic (and strategic) decisions. You make money by buying "goods" when they are at low prices, and selling the "goods" when they are high. This is supply and demand at its best. It's like they made microeconomics fun and addictive, which is no easy feat.
This game is much more entertaining than a stock market simulator because it adds gameplay elements to something that's so cut-and-dried. And unlike many game remakes and continuations, Drug Lord 2 is actually an improvement over its predecessor.