Studies of fear and happiness contagions, for example, suggest that humans in groups begin to synchronize with one another as emotion spreads from person to person.
And they may well prove to be the ultimate breeding grounds for contagions like that now spreading throughout parts of Europe, with northern Germany, thus far, taking the brunt of sorrows.
And with financial systems generally being susceptible to contagions, there may be something to be said for having numerous financial systems running parallel to each other rather than putting all our eggs in one basket.