"revenues from an unrented hotel room are lost forever" refers to which characteristic of services?

Perishability of the service sector. Perishability occurs because services cannot be stored for sale in the future. An empty seat in a plane can't be utilized after takeoff; a restaurant will have to serve fresh food because the previous food would be spoilt. There are many factors that causes service capacity perishability but demand seem to be the chief factor. Demand can vary by the season, time, and cycle; it is quite difficult to forecast sales. Once a service is lost, it is forver lost. And this is because like I said earlier most services cannot be stored, saved, retrieved, once they have been un-used. On a bad day, If a hotel manager end up with too many staff or few bookings. This, of course, means that he will be making losses because revenues from his unrented hotel room are lost forever.