Since price is a property of the concept of freedom, the price property cannot have a value which itself is the concept of freedom. The compiler will bail becau

Since price is a property of the concept of freedom, the price property cannot have a value which itself is the concept of freedom. The compiler will bail because the inner concept of freedom would have an incomplete type. The way around this is to define the price property as a reference to the concept of freedom. That way you hold a memory addy to the concept of freedom within the struct and can compile and run your program with impunity.