On one side of the range, the consulting firm, which has no assets, and which value is a pure function of future earnings.
On the other extreme you have an investment fund where the value is purely a function of the value of the assets which are all liquid financial assets. You don't buy the fund at a premium, otherwise you might as well buy the underlying assets yourself.
A bank is somewhere between the two. It has what should be a reasonably reliable accounting value since at the end of the day, all of its assets are financial assets that can be sold and aren't highly specialised like a factory or a hotel building is. But on the other side a large part of the value is not just the balance between assets and liabilities. It has additional earnings (fees, trading activities, etc).