Anchor: This implies that prices are based on the marginal rather than the regulated, cost-of-service pricing now used throughout much of the country.
Entailed: The implication is that prices are based on the marginal rather than the regulated. 
Contradiction: There is no implication about prices. 
Contradiction: She always places them carefully on the floor.
Contradiction: Two workers talk to each other on a construction site.
Contradiction: They are ready to go to bed.
Contradiction: The girls are sitting in a tree.