The organizing principle behind this grouping, appropriate economic units, is relatively simple: if the activities are located in the same geographic area; if the activities have similarities in the types of business; or if the activities are somehow interdependent, for instance, if they have the same customers, employees or use a single set of books for accounting.
The author is opposed to charging a fee for assets under management (AUM). For a lot of beginning investors, AUM doesn’t work because they don’t have enough in assets. He makes the point that the manager will make money even if the assets go down. True. But the manager’s incentives are lined up with yours: the more your money grows, the more they get paid. That’s not necessarily the case with other way that fees are charged.