Monopoly in General

This is a pretty special example with, as I have said, a lot of simplifying assumptions. Can the conclusions be generalized? To some extent, they can. In general,

A monopoly will charge more than a competitive industry with the same cost conditions
The monopoly will sell less output
In long run equilibrium, the monopoly will receive economic profits
There will be a net loss of consumers' surplus relative to P-competitive equilibrium
This net loss is very roughly proportional to the monopoly profit.