For an order to go through a number of factors have to be satisfied. First you must have enough buying power. Second, there must be adequate volume on the market, since we only allow users to trade up to half of the volume of any security on the market, and finally you must not exceed your position limit. The default position limit is 25% which means you cannot put more than 25% of your portfolio value in a single security. Please note that only professors have the ability to change the position limit for their classes. Once all three factors are satisfied, and given the market is open of course, the trades should execute right away.
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