Yes Longinvestor, this is very interesting, because Berkshires repurchase criteria is linked to book value, but Buffetts method for valuing Berskhire is not linked to book value, which he has stressed several times in recent years. However, this does not seem to have been understood by the masses and once the shift in perception comes, whenever it comes, it will lead to higher valuation.
Another potential for higher valuation comes from the fact that there are "hidden" earnings in the form av earnings retained by the stock portfolio investees, which are not included in Berkshires income statement. If they sell a large chunk of their shares to finance major acquisitions, I think this will also be positive for the Berkshire valuation, since those earnings are fully included in the income statement.
In fact, I Believe Buffett is even more focused on cash flow per share than earnings per share. Thus, the increase in float is a contribution as important as the earnings. In below video he elaborates on this subject.
https://www.youtube.com/watch?v=dssTPawSe-c
One thought experiment I have made is regarding how large repurchases Berkshire can make once they decide to pursue that course of action (which Munger has mentioned is likely to happen one day). Since they will after the tax act be less "punished" for Selling stocks when they are selling above their intrinsic value, I would say that the following would be a possibility if they started today and focused on repurchases for ten years (which they will not do now, but most likely one day once all earnings can not be profitably reinvested, perhaps 10-20 years into the future, perhaps earlier):
Starting Point assumptions, (current, under new tax rate):
- Cash generation including float increase of 32 BUSD
- Excess cash of BUSD 90
- Stock portfolio of at least BUSD 150 (after deducting deferred tax under the new tax rate)
- Assuming that the underlying business momentum and some smaller acquisitions lead to increased cash flow by 6% per year
- Assuming that the stock portfolio increases in value by 6% per year
- Market cap of BUSD 500
Under above assumptions, Berkshire could easily buy back 10% of the stock each year for ten years, if digging into their excess cash and trimming their equity holdings a bit. If assuming that the Berkshire stock goes up by 10% or so per year. That would lead to a reduction in share count by close to 66% and earnings would go up by 80%. Under these assumptions, earnings per share would go up by (1/0,9^10)*(1,06^10)= 414% increase or close to 18% annually compounded. We need to deduct some dividend income because of reduced equity holdings, but I still think we could see 16 - 17% compounded EPS growth.
This is of course just a though experiment, but one day I think something in that direction will happen and I think after running for some time it will fundamentally change the view of how the company is valued, partly because of the fact that implementation of such strategy would mean that the repurchase criteria can no longer be linked to P/B.
In fact, if there are enough shares for sale and the price of the stock does not go up too much, I think such a program could run for several decades and lead to market beating returns for a very long time. The Danish Insurance Company TopDanmark did this for 18 years and the result can be seen on the link below. Despite relatively poor development in profits, the share increased by 15,7% per annum for 18 years due to aggressive share buybacks.
https://valueandopportunity.com/2017/03/29/topdanmark-as-a-cannibal-soon-to-be-set-on-a-dividend-diet/