At least as I read the history, by 1829, Western Europe’s technocratic economists had figured out why these periodic grand mal economic seizures occurred. That year, Jean-Baptiste Say published his Cours Complet d’Economie Politique Pratique, admitting that Thomas Malthus had been at least half right in arguing that an economy could suffer for years from a “general glut” of commodities, with nearly everybody trying to reduce spending below income – in today’s jargon, to deleverage.