Why do desks still use Black-Scholes greeks for risk management when better models exist?

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AcadiFi · Accepted Answer

Black-Scholes greeks survive because they provide a common risk language that is fast, standardized, and easy to aggregate, even when desks know the underlying model is incomplete. A desk may price with richer surface-aware methods but still report risk in delta, gamma, and vega terms because those sensitivities are deeply embedded in systems, hedging dialogue, and management reporting.

Suppose Northpoint Options Market Making uses a local-vol or stochastic-vol framework for valuation. The desk still summarizes exposure using familiar greek buckets because traders, controllers, and risk committees need a shared shorthand. That shorthand is imperfect, especially across strikes and maturities, but it is operationally useful.

The FRM lesson is not that Black-Scholes is universally best. It is that risk systems balance theoretical purity with communication and control practicality. A common language has value. In other words, desks often accept an imperfect measure that everyone can act on faster than a purer measure nobody can operationalize. The downside is that if the model behind the reported greeks is too simplified, exposures can look cleaner than they really are. So the sophisticated answer is: desks keep the language because it is useful, but good risk management remains aware of its consistency limits. Practice more in our FRM question bank.

Why do desks still use Black-Scholes greeks for risk management when better models exist?

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