Anchor: If total volume, instead of pieces per capita, were displayed on the vertical axis, then the Y-intercepts would remain unchanged but the cost curves would be parallel.
Entailed: Total volume, if displayed would changed the cost curves.
Contradiction: Every axis on this chart would change with one simple data switch.
Contradiction: Drinking is not socially acceptable. 
Contradiction: The young adults are at a party with friends
Contradiction: a puddle of mud is making the bird dirty
Contradiction: A child is pretending to steer a ship