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ACCA Strategic Professional · Advanced Financial Management · Application of option pricing theory in investment decisions

Under the Black-Scholes option pricing model, all other inputs remaining unchanged, which of the following changes in the share's characteristics would increase the value of both a European call option and a European put option on that share?

A rise in the volatility of the share's returns increases the value of both calls and puts. The option holder benefits from larger upside or downside movements while the loss is capped at the premium paid. Changes in share price or interest rate move calls and puts in opposite directions.

  1. AA fall in the expected volatility of the share's returns
  2. BA rise in the expected volatility of the share's returnsCorrect
  3. CA rise in the current share price
  4. DA rise in the risk-free rate of interest

Explanation

Higher volatility widens the range of possible future share prices. The holder gains from favourable outcomes while losses are limited to the premium, so both calls and puts gain value. A higher share price raises calls but lowers puts. A higher risk-free rate raises calls but lowers puts. A fall in volatility reduces both.

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