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by nkurz 2120 days ago
I'm still learning too, but the short answer is that the seller of the options needs to manage their risk if the option is exercised. If you sell a call, you are promising to provide a stock on demand at a particular price. The most straightforward way to ensure that you are able to sell a stock in the future is to be holding the stock now. If you don't already have enough of the stock in your portfolio, you need to buy it.

A longer but excellent answer is here: https://youtu.be/9eDqmOPSs9Y?t=908