Two interesting posts by Kevin Roose on a mini-game within Grand Theft Auto V: description of the stock trading platform there (which allows the buying and selling of individual stocks in fake companies) and how some fans have decided to manipulate the virtual markets in the game:

• There are two playable stock exchanges inside GTA V: LCN and BAWSAQ. On each of these exchanges, you can buy and sell stocks using the virtual cash you amass during the course of the game. (This cash has no real-world value, but it can be used to buy houses, airplane hangars, and other cool things inside the game.)

• Most of the time, these stock prices appear to move randomly. But in certain missions, your character is given a tip that, due to an in-game event (usually, an assassination of a CEO), a company’s stock is about to rise or fall precipitously. When this happens, you’re supposed to load up on the stock (or its competitor’s stock), kill the CEO, then profit from your trades.

• Rockstar Games, the makers of GTA V, have hinted (but never confirmed) that BAWSAQ, the second exchange, might be dynamic — in other words, it might move in response to the actions of other GTA V players, whose trades feed into a central online database. If thousands of players around the world happen to buy a bunch of guns simultaneously, the theory went, the BAWSAQ might reflect that activity by raising the price of Ammu-Nation stock (Ammu-Nation being the store where guns are purchased).