Answer: differential
Explanation: Differential benefit refers to the competitive advantage gained by an organisation due to their extra efforts or unique services etc.
Sometimes the firms enjoying differential benefit charge extra price from consumers and still operate efficiently.
In the given case, the restaurant is providing unique service of 24 hour breakfast option. This service will set apart that restaurant from others in the eye of customers.
Hence from the above we can conclude that the given case is an example of differential benefit.