2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/18163We discuss universality of response functions in systems with excited degrees of freedom. We propose a unification of two existing phenomenologies, two-power law decay and deviation from power law due to non-extensivity. A universal curve is derived by maximizing entropy with a non-linear constraint. The same formalism can explain the universal fluctuation curves which have been discovered recently by Bramwell, Holdsworth, and Pinton.revtex 3 with 3 eps-figuresStatistical Mechanicstext