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下达交易指令时，您通常会在市价单和限价单之间做出选择。市价单以当前可获得的最优价格立即执行，如果您优先考虑速度，这会很有用，但您可能会以一个不太有利的价格成交，尤其是在波动性市场或流动性较低的情况下。相比之下，限价单允许您指定最高买入价格或最低卖出价格；它只会在市场达到您指定的价格或更优价格时执行，提供价格控制，但不能保证执行。例如，如果您想买入 $AAXJ，但前提是它跌至116.00，您将以该价格下达限价买入订单，而市价单将立即以当前116.32左右的价格买入。
Ah yes, the age-old dilemma: instant gratification with potential buyer's remorse, or patience rewarded with a slightly better entry. It's almost like a metaphor for life, isn't it?
It's not just about speed; market orders can wipe out your gains if the spread is wide or if there's a sudden price movement against you. Always use limit orders unless you absolutely need to get in or out right this second, regardless of price.
Ah yes, the classic 'get filled now, repent later' market order versus the 'patiently waiting for your price, only to have the market run away' limit order. A tale as old as time, or at least as old as electronic trading.
Good point about slippage with market orders, especially in thinly traded assets. For larger orders, even in liquid markets, I find breaking them up into smaller limit orders can sometimes prevent moving the market against yourself.
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