Anchor: Therefore, an economic trade off must be assessed for each project.
Entailed: Each project must have an assessed economic trade off. 
Contradiction: An economic trade off assessment is not required for each project.
Contradiction: three skiers on top of a mountain
Contradiction: Caleta does not attract big crowds.
Contradiction: The man is jumping on a trampoline.
Contradiction: There is a bicyclist and pedestrians in front of a building.