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When would one actually want to use a market order instead of a limit order?
If you have $10000 and wish to buy 1000 shares of a $10 stock, you risk borrowing on margin if you go over a bit. For some people, that's a non-issue. Some folk with an account worth say, $250K don't mind going over now and then or even let the margin account run $100K on a regular basis.  But your question is about market orders. A limit order above the market price will fast-fill at the market anyway. When I buy a stock, it's longer term usually. A dime on a $30 share price won't affect my buy decision, so market is ok for me.