Oftentimes, doctors, salons and other service providers will charge a cancellation fee if a customer does not show up to their agreed upon appointment time. this is because the provider cannot simply keep that appointment time in inventory for another potential buyer, but rather loses the opportunity to sell that space to someone else once the time has passed. this best demonstrates the fill in the blank, of services.

This best demonstrates the Perishability.  

Explanation:

In marketing field, perishability describes that a service or good cannot be stored for sale in the future.

Perishability states that the goods cannot be produced and stockpiled before demand. The perishable product exists only at the time of their production. Thus it is very difficult to maintain demand and supply of goods, and business gets affected greatly.

Perishability is more common in services and hence it is known as ‘Service Perishability’. Cancellation fee or waiting charge is charged for the perishable service to outstand from loss.

if you have to make a general question and respond to your thoughts, then this isn't really a question someone can you on. read the passage, form your question, and answer using your thoughts. no one else can understand how you interpreted this text if you don't tell us.