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Portfolios for some kind of investors effectively balance asset investments with liabilities incurred. Think about a pension account, where the future liability of the pension payment represents the liability and the currently invested monies are the assets. I am sure you can think of other similar situations but I will illustrate regarding pensions below. ...
As the asker already found out: No this is not simply the answer. $S_T$ is not known at the moment of investment so the future profit is a function of the stochast $S_T$. A graph is a useful tool to gain insight into the amount of profit for each realized value of $S_T$.
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