Assume that the wealth is unevenly distributed in the developing country of Malaria. Only the top 20% of the households can afford a new techno gizmo that presents a positive network externality. If the wealthy adopt the technology and innovate to achieve economies of scale so the poor can afford it, how is income disparity bad?
The wealthy can afford costly R & D while beta versions are debugged. I believe that most social changing innovation occurs this way. So is redistributing the income a good idea?