Hi there!
One of the major effect is: Low voter turnout. La baja participación es más pronunciada en las elecciones primarias, las elecciones fuera de año para legisladores estatales y las elecciones locales.
Any particular time? I guess the most relevant time for this question is early half of 20th century.
I think the event was first world war and some of its consequences (in many countries the monarchy was abolished so people "experimented" with new political organisatons, in Germany the war brought huge reparations which contributed to the deterioration of their economy)
and the global economic crisis of 1920
Price goes up....supply and demand.......