Theta
An option Greek measuring time decay — how much value an option loses each day, all else being equal, as it approaches expiration.
Related terms
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A first-principles guide to options: the right but not the obligation, calls and puts, strike and expiration, what drives the premium, the crucial buyer–seller asymmetry, and the real risks of leverage.
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A detailed guide to the debit spread — a defined-risk options strategy that buys one option and sells another to cut cost and cap both loss and gain. Construction, payoff maths, a full worked example, and when to use it.
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