IGN Stock Exchange

[Pumpkin_Jack]

This is a little piece of genius released by ign it is still in its alpha but its tons of fun.

Essentially it is a fake stock market for video games based primarily on the games views on ign's website and demands for the stock your buying.

IGN SX - The Video Game Stock Exchange
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[Qicmee]

Research says this system should provide reliable information. There are other references available, but I like this one:
Wisdom of the crowd - Wikipedia, the free encyclopedia