Home » Principle of Contribution Principle of Contribution ALLABCDEFGHIJKLMNOPQRSTUVWXYZThe principle of contribution requires an appraiser to measure the value of any improvement to a property by the amount it contributes to market value, not by its cost.Related Articles: Glossary: ContributionRelated Terms:Term: ContributionTerm: Market ValueTerm: ImprovementTerm: Property