If you think one outcome is more probable than its current value indicates, buy some shares to increase its price. You can buy either by entering the amount of money you want to invest or the number of shares you want to buy. You believe a price is too high? Sell some stock! But remember, you can only sell stocks that you already own.

Will Google's stock price be above $284 on 12/31/09?

market created by Michael Arrington and closes on 2009-12-31, or the moment one of the outcomes proves to be true

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Stock	current price	¥€$ to invest	shares to buy	new price
Google above $284 Google's stock price on 12/31/09 is above $284	0.726			0.726
Google below $285 Google's stock price on 12/31/09 is below $285	0.273			0.273

Available cash: 0.0

buy

Remember, Prices equal probabilities. Think a price is too low? Go buy!