Answer:
D) suppliers' goods or services cannot be substituted effectively.
Step-by-step explanation:
Generally when the supplier's industry is highly concentrated (i.e. dominated by only a few firms: oligopoly) or the products do not have direct substitutes, the supplier power increases.
In perfect competition, the power of suppliers and buyers is limited because:
- there are a lot of suppliers and a lot of buyers, so they are all price takers.
- the goods and services are homogeneous, which means that they are all very similar, therefore, they are all substitute products to each other.
- low barriers of entry and exit.
Whenever any of the three conditions is missing, market failures exist (high supplier power is a type of market failure).