Anchor: The method for developing calibrated WTP functions is based on the approach developed by Smith, et al.
Entailed: They develop calibrated WTP functions.
Contradiction: There is no reliable method for calibrating WTP functions.
Contradiction: The cat rolled in the mud.
Contradiction: A car with people walking.
Contradiction: The beach is out of bounds to you.
Contradiction: A group of people standing in front of a car.