2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/200A simple mathematical model is proposed to study the effect of the average trend of a population on the opinion of each individual, when a group decision has to be made by voting. It is shown that if such effect is strong enough a transition to coherent behavior occurs, in which the whole population converges to a single opinion. This transition has the character of a first-order critical phenomenon.5 pages, 5 figures; presented to the First Workshop on the Dynamics of Socio-Economical Systems, La Plata, Argentina, Nov. 1998Adaptation and Self-Organizing Systemstext