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Spread
Basics
무슨 뜻인가요
The gap between the bid (best buy price) and the ask (best sell price). It is a hidden cost you pay on every round trip.
예시
If AAPL bid is $150.00 and ask is $150.05, the spread is $0.05. Buying and instantly selling 100 shares loses $5 to the spread alone.
초보자가 흔히 하는 실수
Beginners ignore the spread on thin markets, then find a "profit" of $0.02 per share vanishes into a $0.10 spread the moment they try to exit.