This is a reference request.
Where can I find an analysis that explains why companies like Microsoft and Amazon don't split into two. At a certain point diseconomies of scale would kick in.
I would like to see an analysis where the economies of scale are compared against the diseconomies of scale and an optimal size is derived that would explain the 144,000 people who work at MS or the 1.3 million that work at Amazon.
Is there an update to the theory of firms that looks at tech companies and their size?