Kathy's once-booming traditional brick-and-mortar travel agency is financially struggling. For many years, the majority of Kathy's revenue came from commissions on airline ticket sales. Now, though, most of Kathy's clients purchase their tickets online instead of from her travel agency. These clients can purchase tickets directly from the airlines or through online travel agencies like Priceline or Expedia. Oftentimes, the tickets that they purchase online are less expensive than the tickets that Kathy offers. This is an example of