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Risk free rate in Black-Scholes

SSaif4y ago
Respected sir, I want to know as to what is the reason behind using a risk-free rate in the calculation of the value of the option using the BSOP model. How does the risk-free rate affect the value of the option?
John MoffatJohn MoffatTutor4y ago#1
It is because the risk (i.e. volatility) of the share price is taken account of separately in the formula. As the risk-free rate increases, the value of a call option increases. However, as the risk-free rate increases, the value of a put option decreases.
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