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Spread
Basics
どういう意味か
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.
例
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.
初心者がよくやるミス
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.