Increase in | Value of call option will | Value of put option will |
value of the underlying | Increase | Decrease |
exercise price | Decrease | Increase |
risk-free rate | Increase | Decrease |
time to expiration | Increase | Increase (exception: a few European puts) |
volatility of the underlying | Increase | Increase |
costs incurred while holding the underlying | Increase | Decrease |
benefits received while holding the underlying | Decrease | Increase |