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6708523 
Journal Article 
Criticism onelasticity-sensitivity coefficient for assessing the robustness and sensitivity of ecosystem services values 
Aschonitis, VG; Gaglio, M; Castaldelli, G; Fano, EA 
2016 
Ecosystem Services
ISSN: 2212-0416 
ELSEVIER SCIENCE BV 
AMSTERDAM 
20 
66-68 
WOS:000382267500007 
The Coefficient of Sensitivity CS (or coefficient of elasticity) is used to determine the sensitivity and robustness of prices (coefficients) in the analysis of Ecosystem Services (ESs). The common CS approach is applied based on a specific % change of an ES coefficient keeping constant the coefficients of the remaining ESs. This approach assumes that when CS value is > 1 then the estimated ES value is non-robust because it is elastic. The aim of this study is to show that the common approach of CS used in ESs studies is erroneously applied and interpreted. A simplistic calculus is provided which shows that the CS values of ESs a) are always in the range between 0 and 1 leading always to the conclusion that the applied coefficients by the users are robust, and b) are always independent by the % change of an ES coefficient defined by the user. Other reasons which question the validity of the common approach are that the CS values a) are always positive which is unrealistic in real market since it always violates the "law of demand" and b) can be manipulated by the user by changing the boundaries of the study area. (C) 2016 Elsevier B.V. All rights reserved. 
Elasticity coefficient; Sensitivity analysis; Robustness of ecosystem services values