Market order vs marketable limit order, the price you cannot see coming
A stock shows bid, offered. You want to buy right now, but you are worried the quote might be stale.
What is the difference between a plain market order and a marketable limit order (a buy limit priced at or above the offer), and what are you trading off?
Show a hint
Both cross the spread and fill immediately in a normal book. Think about the abnormal case: what happens if the offer you saw disappears the instant your order arrives?
Your answer
This one is open-ended. Work it through, then check your reasoning against the full solution.