The golden rules of diversification

In 1941, a mathematician proved that for a rocket to reach the moon, it would have to weigh about one million tonnes at the start. Thirty years later we had put men on the moon. Did we build a million tonne rocket to do it? No. Fuel technology had developed and the idea of “staging” the rocket’s ascent had been conceived, allowing the endeavour to be much more practical. So, was the million-tonne proof wrong? Well, not really: the mathematics were perfect, however the assumptions were incorrect. Whenever we try and analyse or deduce anything, we are forced to make some assumptions, n...