 Nevertheless, the immense acceleration process that occurs during hyperinflation (such as during the German hyperinflation of 1922/23) still remains unclear and unpredictable.The transformation of an inflationary development into the hyperinflation has to be identified as a very complex phenomenon, which could be a further advanced research avenue of the complexity economics in conjunction with research areas like mass hysteria, bandwagon effect, social brain, and mirror neurons.A number of hyperinflations were caused by some sort of extreme negative supply shock, often but not always associated with wars, the breakdown of the communist system or natural disasters.