Which of the following indicators of the threat of buyers in an industry is NOT$$ true?

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Part $1$

A$.$

Products sold to buyers are a significant percentage of a$$ buyer's final costs.

B$.$

Products sold to buyers are differentiated and standard.

C$.$

Buyers are not earning significant economic profits.

D$.$

The number of buyers is small.

E$.$

Buyers threaten backward vertical integration.