Posts Tagged ‘delta

18
Jun
11

Finanzas 101: FX risk reversal

Debido al aumento de volatilidad en el Forex, un concepto interesante para aprender es el Risk Reversal.

(…) This indicator represents a proxy for investor concerns that (currency) will collapse suddenly, and its high level suggests that this is indeed a growing concern. (…)

Según Investopedia

In foreign-exchange trading, risk reversal is the difference in volatility (delta) between similar call and put options, which conveys market information used to make trading decisions.

Para Sala de Inversiones

Muestra la diferencia en volatilidad, y por tanto en precio, entre las puts y las calls sobre las opciones out of the money más liquidas cotizadas en el mercado al contado. Los valores positivos indican que las calls son más caras que las puts (la protección al alza en el subyacente spot es relativamente más cara), mientras que los valores negativos indican que las puts son más caras que las calls (la protección a la baja en el subjacente spot es más cara). Los cambios significativos pueden indicar un cambio en las expectativas de mercado para la dirección futura del tipo de cambio de divisas subyacente spot.

Conforme a Global Market Financial Institute,

The market has established a 25 (0.25) delta benchmark for risk reversal quotes.

Listo con las definiciones básicas, ahora el DB tiene una muy buena guía-del 2006- para sacarle provecho al tema. 

 

 

 

28
Mar
11

Paper: delta hedging y mercados con saltos

A note on delta hedging in markets with jumps

Abstract.

Modeling stock prices via jump processes is common in financial markets. In practice,to hedge a contingent claim one typically uses the so-called delta-hedging strategy. This strategy stems from the Black–Merton–Scholes model where it perfectly replicates contingent claims. From the theoretical viewpoint, there is no reason for this to hold in models with jumps. However inpractice the delta-hedging strategy is widely used and its potential shortcoming in models with jumps is disregarded since such models are typically incomplete and hence most contingent claims are non-attainable. In this note we investigate a complete model with jumps where the delta-hedging strategy is well-defined for regular payoff functions and is uniquely determined via the risk-neutral measure. In this setting we give examples of (admissible) delta-hedging strategies with boundeddiscounted value processes, which nevertheless fail to replicate the respective bounded contingent claims. This demonstrates that the deficiency of the delta-hedging strategy in the presence of jumps is not due to the incompleteness of the model but is inherent in the discontinuity of the trajectories.

Link al Paper

06
Oct
10

Finanzas 101: El “Encanto” de una Opcion

Condor Options tiene un breve e ilustrado post sobre el delta decay. Así mismo menciona libros como el de McMillan y el de Natenberg.

But even the Natenberg book (and, if I remember correctly, McMillan) don’t discuss the difference between the deltas of options with identical strike prices but different expirations. As expiration approaches, the delta of in-the-money options approaches one, while the delta of out-of-the-money options approaches zero. Known also as “charm,” delta decay is a second-order Greek that measures the rate of change of delta per day.




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