After I understand the delta derivation from BSM, what other Greeks can I derive using the same technique?
The product rule + chain rule approach gives $\Delta = e^{-qT} N(d_1)$. What about gamma, vega, theta, and rho? Are they all derived the same way? Which ones are easy vs hard?
All five major Greeks can be derived from the BSM formula using the same partial-derivative machinery, but they vary in algebraic difficulty. Here is the full taxonomy.
Delta () — easy: the derivation we just walked through. Result: .
Gamma () — easy if you have delta: differentiate delta one more time. Result:
Same for calls AND puts (gamma is symmetric). Always positive for long options.
Vega () — medium: differentiate the call formula with respect to . Both and depend on , so chain rule on both. After applying the magical identity, you get:
Same for calls AND puts. Always positive (more vol means more option value).
Theta () — hard: the most algebraically painful Greek. Multiple terms because and both depend on , AND the discount factors and depend on directly. After heroic algebra:
Negative for long calls (time decay hurts). Slightly different signs for puts.
Rho () — easy: differentiate with respect to . The only term that depends on is , but also depends on . After applying the identity again:
Positive for calls (higher rates make calls more valuable for non-dividend stocks because the forward rises).
Difficulty ranking (easiest to hardest):
- Delta — one application of chain rule + the identity
- Gamma — differentiate delta once more, comes from chain rule on
- Vega — chain rule on , identity cancels most terms
- Rho — only one term depends on , identity gives clean cancellation
- Theta — multiple time dependencies, multiple terms survive
The recurring trick:
Every Greek derivation uses the same algebraic identity to cancel terms. Once you have proven that identity once, all five Greeks fall out of the same machinery. This is why BSM is so beloved by quants — the math has internal symmetry that makes every related calculation tractable.
What CFA Level II expects:
You should know the closed forms for , , , , and be able to apply them in numerical questions. You do NOT need to reproduce the derivations on the exam. Focus your study on plugging numbers in, interpreting signs (Greeks symbols), and understanding what each Greek tells you about risk.
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