Multiple Choice Question

Sasha has run a small diner near the train station for the past ten years. Six months ago, a chain restaurant serving gourmet burgers and sandwiches opened up near him and he has had to rethink his menu. He added some specialty sandwiches and free fries with every burger in order to retain his customers. Which of Porter's five competitive forces has affected Sasha's business?

Bargaining power of buyers

Bargaining power of suppliers

Threats of substitute services

Threats of new entrants