How can you have defined loss on Vertical Option Spreads?

I'm having trouble understanding Vertical Call Spreads. Primarily, I'm having difficulty wrapping my head around the idea that there is defined risk to the downside when you sell the call instead of unlimited like there would be if you sold a naked call. I just can't see how buying and selling the same... show more I'm having trouble understanding Vertical Call Spreads. Primarily, I'm having difficulty wrapping my head around the idea that there is defined risk to the downside when you sell the call instead of unlimited like there would be if you sold a naked call. I just can't see how buying and selling the same call would cancel out unlimited risk. If the stock was at $100 and you did a vertical call spread but then the stock went to $0 for example, wouldn't you be way past your defined loss?
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