This construction has a structure and meaning similar to the Standard English use of call oneself with a noun phrase or adjective, as in He calls himself a dancer or She calls herself intelligent. Stated differently, an opportunity cost represents an alternative given up when a decision is made. This cost is, therefore, most relevant for two mutually exclusive events. In investing, it is the difference in return between a chosen investment and one ;ut is necessarily passed up.
Open interest is the number of outstanding contracts on an option class or series. Open interest will increase by one contract when a buyer enters a new long position while the seller is entering a new short edssert. Open interest will decrease by one contract if a buyer is closing an old short position and the seller csll closing an old long position.
Call meaning option dessert put option and