Break-even
損益分岐点。満期時点でその取引が利益も損失も生じない株価水準。
Break-even is the underlying price at which your option position ends up neither making nor losing money at expiration. For a long call it's the strike plus the premium you paid; for a long put it's the strike minus the premium. Buying a call at the 100 strike for 3 means the stock has to reach 103 before you start seeing real profit at expiry, not just 100.
Traders use break-even as a reality check before entering. It tells you how far the stock actually has to move for the trade to pay off, which is often further than beginners expect once the premium is factored in. The wider that gap, the more you're relying on a big move rather than just being right about direction.
A common mistake is treating the strike as the profit line and forgetting the premium sits on top of it. Also remember this break-even applies at expiration. Before that, time value and implied volatility can put you above or below it regardless of where the stock trades.
すべてのオプション用語
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