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I am not sure they are taking into account realistic transaction fees.

It would be interesting to add standard fee's to the game.

They might be specifically picking stocks that have done well.

In that case, you would on average make more money in this game than you would in real life.

I think they chose well-known corporations; Enron was one.

I had Coke and Netflix.

In that case, the stock market seems like easy money, especially if it's about reflexes as you can have a computer do the work and trade in hundred of stocks simultaneously.