[somethoughts]

I think the most likely business unit that would be considered a monopoly is its IAAS business unit called AWS which has a very high profit margin. Ecommerce and E-books/books are probably the runner ups.

With those two business units, Amazon can then subsidize short term loss making business strategies and M&A that focus on gaining an eventually obtaining a monopoly advantage such as grocery, general brick and mortar retail, shipping and logistics, tablets, etc.

The other companies in technology focus on PAAS, self driving cars and VR, etc. and haven't used their profit margins to extend into the real world thus far.