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Understanding the synthetic long put option
A long put - you have a small initial cost (the option premium) but profit as the stock goes down. You have no additional risk if the shock rises, even a lot. Short a stock - you gain if the stock drops, but have unlimited risk if it rises, the call mitigates this, by capping that rising stock risk. The profit/loss graph looks similar to the long put when you hold both the short position and the long call.  You might consider producing a graph or spreadsheet to compare positions. You can easily sketch put, call, long stock, short stock, and study how combinations of positions can synthetically look like other positions. Often, when a stock has no shares to short, the synthetic short can help you put your stock position in place.