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Why does a long/purchased call option have a long position in the option itself?
If it helps you to think about it, long is equivalent to betting for the upside and short is equivalent to betting for the downside. If you are long on options, then you expect the value of such options to increase.  If you are long an option, then you own the option.  If you are short an option, then generally you sold the option.  Someone who is short a call (sometimes called the writer or occasionally the issuer) has sold a call option to someone who is now long a call. Buying a call option that will increase in value is itself a form of investment, just as it's investment to buy stock or other instruments hoping they will appreciate in value.  An option's value will rise or fall with the underlying, so being long an option is a way to be long in the underlying.  Someone can be long in a stock by buying the stock, or long in a call by buying call options in the stock.  The long call generally requires less initial investment than buying the underlying, and lets the option-holder avoid the asset downside during the option term.  The risk is that the asset may not appreciate to the point that the call option will pay off. In the conceptual sense, a share of stock is a particular right to the profits and assets of a corporation, both in form of dividends and in liquidation.  An option is a particular right to the the share of stock.  It's just a further way to formalize and subdivide the various property rights that exist in a corporation.  If you can buy a piece of paper with particular rights to corporate profits and assets, then you can buy another piece of paper with particular rights to the former piece of paper.