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The extended model of two-leg Ising spin ladder with trimer rungs and nextnearest neighbor interaction (NNN) in an external magnetic field is studiedusing the transfer matrix and linear renormalization group methods. In thestandard version (with the same only NN interactions in both legs) such aladder exhibits very interesting behavior - a frustration driven extremelysharp phase crossover at finite temperature which resembles a phase transition,impossible in one dimension. It is shown that in all considered cases withdifferent interactions in each leg (assymetric ladder), with NNN interactionsand in the presence of small external field such a crossover takes place whenthe point at which the effective interleg coupling vanishes coincides with thepoint at which the interleg correlation function exhibits an inflection pointaccompanied by the specific heat maximum. A hypothesis is formulated that todescribe an abrupt change in political view of the people it is not necessaryto resort to a concept of a phase transition, controversial for social systems.In some cases, this phenomenon can be understood as a phase crossover triggeredby the level of frustration. The source of this frustration is proposed as aninternal conflict between two areas of attitudes of the society members,personal and economic, which are shaped by personality traits possibly modifiedby life experience.

Ising spin ladder with trimer rungs and next-nearest-neighbor coupling. Frustration in physics and agent models