75. The appraisal principle that states that the value of any component of a property is what it gives to the value of the whole or what its absence detracts from the whole is called:
Contribution says that the value of any component of a property is what its addition contributes to the value of the whole. Don't confuse this with the other principles of value - conformity, which says that the maximum value is realized if the use of the land conforms to existing neighborhood standards; anticipation, which says that the value can increase or decrease in anticipation of some future benefit/problem affecting the property; or competition, which says that excess profits will attract competition.
Contribution, anticipation, and competition are all principles of value.