Question: Consider two call options based on Twitter. Both calls have a $40 strike price. However, one call expires in 8 months' time, whereas as the

Consider two call options based on Twitter. Both calls have a $40 strike price. However, one call expires in 8 months' time, whereas as the other call expires in 4 months' time.

The call that expires in 8 months will be priced higher than the call that expires in 4 months. This is because the former has more time for share price to move up above the strike price allowing the call to finish in the money.

However, one could argue that there is also more time for share price to move downwards, meaning the call option may finish out of the money.

Explain why more time before expiry results in an increase in the value of a call option.

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