For years, Warren Buffett has focused on finding the strongest companies with the best competitive positions and buying them when they're cheap. It's a strategy that has made him billions, and one that's perfectly suited to today's market.
After all, these days, you can buy many of the best companies in the world for a fraction of their fair value. You just need to be brave enough to face the volatility.
But ironically, the biggest risk to this strategy isn't the daily volatility. If a company's truly strong, it will be able to survive even if we hit a depression. The real risk is buying a company whose competitive position is weakening, or weaker than it appears.
Deceptively weak barriers
Often, a business seems to have strong barriers against competition simply because it has a well-known brand and large market share. In markets where there are significant economies of scale, such as many manufacturing or distribution businesses, market share can be a huge barrier. But if the economies of scale are relatively insignificant, a competitive advantage because of market share can be far weaker than it appears.
Motorola faces stiff competition from Nokia, whose mobile devices segment enjoys superior margins. Meanwhile, Research In Motion
Contrast this with the computer chip industry, which, being far more commoditized, offers greater economies of scale. That's what has enabled Intel
The impact of fewer people reading newspapers has been obvious for years, as advertising dollars have fled from papers to the Internet. Meanwhile, Craigslist, Amazon.com
While TV viewing is at all-time highs, couch potatoes have more channels than ever before, meaning the market is more fragmented. The rise of Internet television only increases market fragmentation. As if that weren't enough, personal video recorders (PVRs) and file-sharing networks have made it much easier for consumers to skip commercials. These changes will result in lower ad rates, and weaken the competitive position of TV networks.
Watch out for technology
It's no coincidence that new technology is playing a big role in weakening the TV networks. Game-changing technology is one of the biggest risks that a company can face, and that risk isn't limited to high-tech businesses. Even a low-tech business like storage can be affected.
For decades, Iron Mountain built a boring business with a huge moat -- storing records for doctors, lawyers, and anyone else who generates a lot of paper. However, with more data being stored electronically -- including America's transition to electronic medical records -- the need for paper storage should decline. This trend isn't happening quickly, but it seems inevitable.
Iron Mountain recognizes the risk and isn't just sitting back. It's working on electronic record storage. But it's unlikely that the company will achieve the same dominance as it enters a new arena populated by tough, experienced competitors like EMC and IBM.
So when looking at beaten-down blue chips, be particularly aware of the technological threats to the business. The Internet isn't cutting-edge technology anymore, but it's only now becoming apparent how it's gradually eroding the moats of many businesses.
The Foolish bottom line
That said, this doesn't mean that you should never buy any company whose moat has weakened. Even from an eroding competitive position, some blue chips can generate cash for decades. But make sure that the price you pay is cheap, even considering the impoverished prospects of the business.
If you are looking to take advantage of the market decline, our Motley Fool Inside Value team spends a lot of time thinking about moats, and we've identified many excellent stocks that look exceptionally cheap today. You can read about them for free by clicking here for a 30-day free trial.
This article was originally published May 22, 2009. It has been updated.
Fool contributor Richard Gibbons is looking to buy a swamp monster to put in his moat. He owns shares of eBay. Apple, Amazon, and eBay are Stock Advisor recommendations. Intel and Nokia are Inside Value picks. Motley Fool Options recommends buying calls on Intel and diagonal calls on eBay. The Fool's disclosure policy wants to be an Alt-A mortgage when it grows up.