I came up with Prestige Theory some years ago when exploring an abandoned railway line. The idea behind it is that when a company or organisation is doing well the people running it need an outlet for their energies. As a consequence they embark on projects which have no commercial value, rather they are simply ways to show corporate virility. Victorian railway companies used to do it, as did supermarkets until a few years ago. Anyway I’ve set it out in detail in my book The Dynamics of a Coalfield. I’ll be posting up details shortly. Prestige Theory is an essay but if anyone could synthesise it into a mathematical formula I’d be grateful.