Maybe its better to say that no one should ever _intentionally_ use a market order if a limit order is possible? A limit order to buy at 10% below the market p

Maybe its better to say that no one should ever _intentionally_ use a market order if a limit order is possible? A limit order to buy at 10% below the market price is effectively a market order in normal market conditions because it still fills at the best price, but you're also protected from abnormal conditions. So the limit order is lower risk and you got that lower risk for free (if the commission is the same), so why would you ever use a higher risk order type for no benefit? The exception is if you're forced to enter an order because of a previous transaction. In that case the risk inherent in market vs limit was a part of the transaction that you're being forced to exit. In fact being forced to exit introduces a new risk, time to fill, and a market order is the best way to mitigate that risk vs a limit order. Use a limit order if you're doing the trade on your own terms because you reduce your risk for free.