Warren Buffett's Berkshire Hathaway (NYSE: BRK-A) (NYSE: BRK-B) is doing something it's never done before: It's buying back its own shares.

I think the move is great news for Berkshire shareholders. As my fellow Fool Morgan Housel noted, prior to the buyout-announcement pop, Berkshire shares were trading at a mere 1.02 times book value, the cheapest level they've seen in decades. According to Bloomberg, the stock has traded at an average book value multiple of 1.55 since 2000.

But an interesting question is whether this is a bearish sign for the rest of the market. If Buffett is opting to buy back Berkshire stock -- something he's never done before -- rather than sink the same cash into shares of other publicly traded companies, does this mean that he doesn't see bargains elsewhere?

Probably not
I would wager that this is much more of a reflection on the cheapness of Berkshire's stock than a view that there aren't bargains in the rest of the market. Though Berkshire's stock has recovered 48% since the market's low in March 2009, it's fallen well short of the gains on both the S&P 500 and larger-cap-focused Dow Jones.

Source: Yahoo! Finance.

Berkshire's business has hardly flat-lined since that point, but the stock's valuation has gone almost nowhere. At its lowest point in 2009, Berkshire's stock traded at a price-to-book multiple of 0.97, so prior to the buyback announcement, we could say that the stock was still trading at crisis levels.

The devil's advocate may say, "Yes, but when Berkshire was trading at these levels during the crisis, Buffett chose to put his money into companies like Goldman Sachs and GE (NYSE: GE) rather than Berkshire, so why the change now?"

That's actually pretty easy to address. Though Berkshire's stock got battered during the crisis, other stocks took an even harder hit. At their respective low points, Goldman and GE saw price-to-book value multiples of 0.48 and 0.67, respectively. Not only that, but because of the paucity of funding sources at the time, Buffett was able to get sweetheart deals on both of those investments that gave Berkshire preferred stock, fat dividends, and warrants to boot.

It's not like Buffett isn't buying elsewhere
Surmising that Buffett doesn't see bargains outside of Berkshire would be easier if he wasn't also making other non-Berkshire buys. Bloomberg cited Buffett as saying that he spent more on stocks on Aug. 8 than at any other point during the year. When talking to Fortune a few days after that, Buffett quipped: "The lower things go, the more I buy. We are in the business of buying."

We won't know for another month or so what exactly Buffett was buying in August, but we do know that he added to Berkshire's portfolio through the first half of the year, including boosting his huge Wells Fargo stake and adding to his position in British grocer Tesco. And of course we can't forget the preferred investment he made in Bank of America (NYSE: BAC).

Value, value everywhere...
Bloomberg ran the headline "Buffett Buyback Shows S&P 500 Passes Berkshire Value Test," which was rather confusing since the article noted that the index would have to fall around 40% for its book value multiple to match Buffett's Berkshire target.

But even if the overall index doesn't have a Berkshire-esque valuation, there are plenty of individual stocks that are as cheap, if not cheaper. Wells Fargo currently trades right around its book value, while JPMorgan Chase and Bank of America have multiples of 0.71 and 0.33, respectively. Insurers MetLife (NYSE: MET) and WellPoint change hands at book value multiples of 0.57 and 0.99, respectively, while asset manager BlackRock is at 1.1.

And while book value multiples are great for valuing financial businesses, they can be less useful when looking at other types of businesses. From a price-to-earnings perspective, there are plenty of other bargains to be found including Microsoft, Chevron (NYSE: CVX), and AT&T (NYSE: T), which sport P/E multiples of 9.5, 8, and 8.6, respectively.

No called strikes
Looking back over Warren Buffett's history, it's clear that he doesn't take action for action's sake. If there are no bargains available, he's perfectly comfortable sitting on his hands and letting Berkshire's cash wait around. So if you're concerned that Buffett is buying back Berkshire stock simply because he doesn't see anything else worthwhile out there, don't be. This simply means that Berkshire's stock is a screaming bargain.

Want to keep a closer eye on Berkshire Hathaway and what Warren Buffett is doing? Add the stock to your Foolish watchlist. And if you don't have a watchlist yet, you're in luck -- you can start one up right now for free.

This article represents the opinion of the writer, who may disagree with the “official” recommendation position of a Motley Fool premium advisory service. We’re motley! Questioning an investing thesis -- even one of our own -- helps us all think critically about investing and make decisions that help us become smarter, happier, and richer.