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How Does Changing the Strike Price Affect the Premium of a Call Option?

For a call option, lowering the strike price increases the option's premium, all else being equal. A lower strike price means the option is closer to or further into the 'in-the-money' region, making it more valuable as the potential profit is higher and the chance of being profitable is greater.

Conversely, raising the strike price lowers the premium.

What Is the Effect of Selling an Out-of-the-Money Call versus an In-the-Money Call on Premium Received?
Explain How the Effective Spread Is Used as a Metric for Broker Execution Quality
How Does an Option’s “Moneyness” (In-the-Money Vs. Out-of-the-Money) Affect Its Theta?
How Does a Change in the Risk-Free Interest Rate Affect the Premium of a Call Option?