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Are stocks always able to be bought and sold at market price?
There needs to be a buyer of the shares you are offering.  There are a lot of feature rich options for buying and selling.  I don't understand them all in depth, but for example on TD Ameritrade here are some of the order types "Limit", "Market", "Stop Market", "Stop Limit", "Trailing Stop %", "Trailing Stop $".  This web page will explain the different order types https://invest.ameritrade.com/cgi-bin/apps/u/PLoad?pagename=tutorial/orderTypes/overview.html Stock with a higher volume will allow your trade to execute faster, since there are more frequent trades than stocks with lower volume. (UPDATE: More specifically, not more frequent trades, but more shares changing hands.) I'm a bit of a noob myself, but that's what I understand.