Six Degrees: The Science of a Connected Age by Duncan Watts
In 1999, Barabasi and Albert published a ground breaking paper "Emergence of Scaling in Random Networks." Science, 286, 509-512. (1999). This paper showed that certain connections in real world networks don't have a normal ("bell curve") distribution but rather follow a power law distribution. This means that there is an increased likelihood of extreme events in such "scale free" networks. As a result, in scale-free networks, as networks evolve, a few nodes will be "hubs" with an extraordinary number of connections. Barabasi and Albert also found that the evolution of these hubs depended on the combination of network growth and "preferential attachment" - the tendency for new nodes to connect to those already well connected (the "rich get richer" effect.)”
We know how leftist activists created a crisis and turned the mortgage lending business into a “mortgage welfare entitlement” lending policy. We know that the hub we know as “mortgage banking” failed, bringing down the rest of the economy with it. What we don’t know is how the failure was timed.