Anchor: One is tempted to argue that there should be a defensible study, but the problem is obvious- some private firms undoubtedly base contracts on the judgment of the managers involved.
Entailed: The judgement of managers is undoubtedly the basis for some contracts.
Contradiction: Contracts are based strictly on empirical evidence that can be verified by outside auditors. 
Contradiction: There are no beaches protected from the open ocean. 
Contradiction: there are men playing instruments
Contradiction: A man is doing bike tricks.
Contradiction: There is a person with a boogie board.