Answer:Rare,costly to imitate
Step-by-step explanation:
Competitive advantage is the superiority gained and enjoyed by a business entity by providing cheaper services or products to its customers when compared to other business entities whose prices are higher for the same quality, quantity and value. For a business entity to continue to enjoy competitive advantage the resources and capabilities of the business entity must be non-substitutable ( it must not be replaceable),it must be valuable,rare and costly to imitate. The potential to become a business entity with a competitive advantage it must be very difficult to achieve.