In his annual report, though not his more well-known letter, Buffett talked about intrinsic value. ?It was on pages 107-108, and here it is:

Now let?s focus on a term that I mentioned earlier and that you will encounter in future annual reports.

Intrinsic value is an all-important concept that offers the only logical approach to evaluating the relative attractiveness of?investments and businesses. Intrinsic value can be defined simply: It is the discounted value of the cash that can be taken out of a?business during its remaining life.

The calculation of intrinsic value, though, is not so simple. As our definition suggests, intrinsic value is an estimate rather than a?precise figure, and it is additionally an estimate that must be changed if interest rates move or forecasts of future cash flows are?revised. Two people looking at the same set of facts, moreover ? and this would apply even to Charlie and me ? will almost inevitably?come up with at least slightly different intrinsic value figures. That is one reason we never give you our estimates of intrinsic value. ?What our annual reports do supply, though, are the facts that we ourselves use to calculate this value.

Meanwhile, we regularly report our per-share book value, an easily calculable number, though one of limited use. The?limitations do not arise from our holdings of marketable securities, which are carried on our books at their current prices. Rather the?inadequacies of book value have to do with the companies we control, whose values as stated on our books may be far different from?their intrinsic values.

The disparity can go in either direction. For example, in 1964 we could state with certitude that Berkshire?s per-share book?value was $19.46. However, that figure considerably overstated the company?s intrinsic value, since all of the company?s resources?were tied up in a sub-profitable textile business. Our textile assets had neither going-concern nor liquidation values equal to their?carrying values. Today, however, Berkshire?s situation is reversed: Now, our book value far understates Berkshire?s intrinsic value, a?point true because many of the businesses we control are worth much more than their carrying value.

Inadequate though they are in telling the story, we give you Berkshire?s book-value figures because they today serve as a rough,?albeit significantly understated, tracking measure for Berkshire?s intrinsic value. In other words, the percentage change in book value?in any given year is likely to be reasonably close to that year?s change in intrinsic value.

You can gain some insight into the differences between book value and intrinsic value by looking at one form of investment, a?college education. Think of the education?s cost as its ?book value.? If this cost is to be accurate, it should include the earnings that?were foregone by the student because he chose college rather than a job.?

For this exercise, we will ignore the important non-economic benefits of an education and focus strictly on its economic value.?First, we must estimate the earnings that the graduate will receive over his lifetime and subtract from that figure an estimate of what?he would have earned had he lacked his education. That gives us an excess earnings figure, which must then be discounted, at an appropriate interest rate, back to graduation day. The dollar result equals the intrinsic economic value of the education.

Some graduates will find that the book value of their education exceeds its intrinsic value, which means that whoever paid for?the education?didn’t?get his money?s worth. In other cases, the intrinsic value of an education will far exceed its book value, a?result?that proves capital was wisely deployed. In all cases, what is clear is that book value is meaningless as an indicator of intrinsic value.

There are two problems with intrinsic value:

1. We don’t really know what future free cash flow will be, nor the willingness and ability of management to use it wisely.
2. We really don’t know what the cost of capital is for a firm, particularly not the cost of equity.

With simple firms, we can try to do a sum-of-the-parts analysis off of comparable companies — but often the differences are significant. ?It’s not easy.

Buffett has drawn a line in the sand, and that line has held so far — he buys back shares when the price drops below 1.2x book value. ?At present, that is his proxy for what I suspect is his minimum view of what BRK is worth.

This offers an experimental way of attempting to estimate intrinsic value, that is, if you are the CEO or CFO. ?Set up a valuation metric off of book or sales, since they don’t move as much as earnings, and then offer to buy back shares at a multiple of the metric that you think represents intrinsic value.

If you don’t buy many shares, you might want to move the multiple up. ?If shares come flooding in, move the multiple down. Oops, did I forget to mention “be conservative initially?”

I think Buffett is setting an example to other management teams on how to run an intelligent buyback. ?The main principle is this: buy back shares during a panic, or during a malaise that does not reflect future prospects. ?Don’t buy back shares all of the time. ?Wait for bargains to buy back shares.

If you set the barrier on when you buy shares such that it happens a few times a year, and cash levels never get too low, you’ve probably set up a good buyback plan, and as a bonus, you have a decent conservative idea of what the intrinsic value is for your stock.

I think it would make a lot of sense for CEOs and CFOs to imitate Buffett, and make their buybacks contingent on a certain multiple of book value or sales. ?Adapt the level to demand, and be conservative — it is far better to not make so much money, than to give away give away value by overpaying for your stock. ?You can always buy back more stock later; you can’t un-buy stock.

The side benefit of an exercise like this to a corporation is that it will understand its cost of capital well, and will be all the more able to make intelligent decisions on mergers and acquisitions, stock buybacks and issuance.

Full Disclosure: Long BRK/B for clients and me