Anchor: Other nation products--its purported AIDS cure, for instance--have undermined their claim that black businesses are less exploitative than white ones.
Entailed: Their claim that black business are less exploitative then others is undermined by certain products.
Contradiction: There are no products which could undermine the claim that business is less or more exploitative than any other.
Contradiction: A woman strolls through a store putting items in her grocery cat.
Contradiction: The chain was straining. 
Contradiction: The change was not apparent for many years.
Contradiction: In the end, Napoleon followers met their demise.