Ahh... the downside in the difference in the premium. The upside is the difference in the strike price. If you just bought the 77.5 call you pay for all of the premium of call. But you have unlimited upside... So you get a discount on the option and forgo a little upside.
I assume you need some collateral to do that, selling the 79 calls without the stock. I know we've this conversation before...
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