Moneyness

マネーネス。権利行使価格が株価に対してどの位置にあるか、すなわちイン・アット・アウト・オブ・ザ・マネーのいずれかを示す。

Moneyness describes where an option's strike sits relative to the current price of the underlying. A call is in the money when the stock trades above the strike, at the money when they roughly line up, and out of the money when the stock is below. For puts the logic flips. It sounds like a small detail, but it drives how much of the premium is real intrinsic value and how much is just time value that decays.

In practice traders use moneyness as shorthand for risk and behaviour. If AAPL trades at 150, a 130 call is deep in the money and moves almost dollar-for-dollar with the stock (delta near 1), while a 180 call is out of the money, cheap, and mostly a bet that things move fast before expiry. The further out of the money you go, the higher the odds the option expires worthless.

A common mistake is treating cheap out-of-the-money options as bargains. They are cheap because the market judges them unlikely to pay off, and theta grinds them down every day the underlying stays put. Moneyness tells you what you are actually buying, not whether it is a good deal.

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