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Tick
Basics
どういう意味か
The smallest possible price change for a specific market, and also a single traded transaction. The tick size sets the minimum step a price can move.
例
For most US stocks the tick size is $0.01, so a price can move from $10.00 to $10.01 but not to $10.005. In ES futures, one tick is 0.25 points ($12.50).
初心者がよくやるミス
Beginners try to place limit orders between ticks (e.g. $10.005) and are confused when the broker rejects them; prices can only step in tick-sized increments.