Space Trader: Merchant Marine
It's a fun game. It's a trading game from a first person perspective.
For those who watched the video, it does have a FPS element to it, but the main game does not revolve around the FPS portion of the game. Most of the game revolves around selling items that you have either bought from other traders or found in exploration mode.
This game also has a learning curve to it; it teaches you about the mechanics of how marketing works. This would be a good game for somebody who's looking to get into future/stock trading, but wants the learning process to be fun. It was only $5.00 when I bought it, where a book on future/stock trading would cost you significantly more.