economic moats and competitive advantage

In short

I once watched a man named Walter run a hardware store for forty years, and he never worried much about the big chain that opened down the road. A reader who studies a business should ask the same question Walter's customers answered every Saturday: why do people keep coming back? An economic moat is the lasting edge that protects a company's profits from rivals. You can look for it by asking whether the company can raise prices without losing its buyers. You can also ask whether switching away would cost a customer real money or real trouble. Check the company's yearly report, which the Securities and Exchange Commission calls Form 10-K, for the numbers behind the answer. A moat is a claim to test, never a fact to trust. Look for the evidence first.

The whole of it

What it is

A friend of mine who farms outside Springfield says the best land is not the flattest or the greenest. It is the land with water nobody else can reach. A business works the same way. The word moat comes from the ditch around a castle, and investors borrowed it to describe whatever keeps competitors out of a company's profits. The idea is old, but writers like Warren Buffett made it famous in letters to the owners of Berkshire Hathaway.

A moat is not the same as being good. Plenty of well run companies have no moat at all. A corner bakery with fine bread has happy customers, but a new bakery can open next month and bake just as well. A moat needs something harder to copy. It might be a famous brand, a patent, a huge network of users, a cost that rivals cannot match, or a product so tied into a customer's daily work that leaving feels painful. Nobody can build these overnight. That is why they last.

Think of it as a question about time. Many firms earn fat profits for a year or two. The better question is whether those profits can survive ten years of hungry competitors. If you are holding an interest in a company, that question matters more than last quarter's good news.

How it works

If you have ever stayed with a bank because moving your bills felt like a chore, you have felt one kind of moat. Economists call it switching costs. The customer could leave, but the price of leaving is higher than the gain. Software firms lean on this a great deal. A company that has trained five hundred workers on one program will think hard before changing.

A second kind is the network effect. A phone is worthless if nobody else owns one, and it grows more useful with every new owner. A marketplace that has the most buyers draws the most sellers, and the most sellers draw still more buyers. Rivals face a lonely start. Three words sum it up. Crowds attract crowds.

A third kind is low cost. A firm that makes something for less than everyone else can sell at a price rivals cannot match and still earn a profit. Scale helps here. A big shipper spreads its trucks and warehouses over so many packages that each one costs less to move.

A fourth kind is the intangible asset, which means something valuable you cannot touch. A patent gives a drugmaker the sole right to sell a medicine for a set period. A license can limit how many firms may operate in a field. A brand can let a company charge more for the same box of cereal. The proof shows up in the books. A real moat tends to appear as steady profit margins and high returns on the money the company has put to work. A weak one shows up as profits that rise and fall with every new rival.

The numbers, and where to find yours

You have probably read a company's good news in a press release and wondered how much of it was real. The place to check is the filing, and the filings are free. Every public company in America must file a Form 10-K with the Securities and Exchange Commission, and you can read them on the SEC's EDGAR database. The report lists revenue, costs, profit, and the risks the company itself worries about. That last part is honest reading, because the law pushes managers to say what could go wrong.

Two measures help most. The first is gross margin, which is the share of each sale left after the direct cost of making the product. The second is return on invested capital, which asks how much profit the company earns for each dollar put into the business. Neither number proves a moat. A fat margin that holds for ten years is a strong hint. A fat margin that shrinks every year is a warning.

Pull the last ten years of a company's reports, if they exist, and set the margins side by side. A steady line is worth more than a single great year. Morningstar publishes its own moat ratings of wide, narrow, or none, and you can read how it assigns them on its website. Treat that as one opinion among several. Your own reading of the 10-K belongs beside it.

A worked example

Let me tell you about a woman named Dorothy, who owns a small number of shares and wanted to understand why. She looked at two imaginary companies. Call them Anchor Software and Brightline Bakery, which she made up so she could study the idea with no real money at stake.

Anchor earned $400 million in sales last year and kept $320 million after the direct cost of making its product. Brightline earned $400 million too and kept $120 million. Dorothy worked out each gross margin by dividing what was kept by the sales. For Anchor, $320 million divided by $400 million is 0.80, or 80 percent. For Brightline, $120 million divided by $400 million is 0.30, or 30 percent.

That gap caught her eye, but one year proves little. She went back ten years. Anchor's margin ran between 78 percent and 82 percent the whole time. Brightline's bounced from 18 percent to 34 percent. She also checked what happened when Anchor raised its price by 5 percent. Customers stayed, and sales kept growing. When Brightline raised its price by 5 percent, sales fell, because shoppers walked to the cheaper bakery.

Next she asked why. Anchor's customers had trained staff on the program and stored years of records inside it. Moving would cost an estimated $2,000,000 in retraining and lost time. The yearly fee was $300,000. At that rate, $2,000,000 divided by $300,000 is about 6.67, so a customer would have to wait nearly seven years of fees before leaving paid for itself. Brightline's customers could switch for the price of a loaf. Dorothy now had a reason, not just a feeling. She also noted that Anchor's lead was a claim she would need to keep checking, because new software can arrive and change the picture.

Where it goes wrong

A neighbor of mine once swore a certain camera company could never fall, since everyone knew its name. Then phones put a camera in every pocket. A moat can dry up, and the water often drains from a direction nobody was watching. New technology is the usual cause. A cheaper rival, a new law, or a shift in what customers want can do it too.

The second trouble is paying too much. Even a company with a real moat can be a poor choice at a silly price. A moat tells you about the quality of a business. It says nothing about whether today's price is fair. Those are two separate questions, and mixing them is an easy slip.

Third, a good story can fool a careful person. We all love a tidy tale about a brand we admire. Famous does not mean protected. Many beloved companies earn thin profits because rivals can copy them with ease. Ask for the numbers, and ask for them over many years.

Last, remember that a moat is a judgment, not a measurement. Two honest analysts can look at the same company and disagree. That is no failing on your part. It is simply how hard the question is.

Questions to answer before you leave this page

Can the company raise its prices and keep its customers, and what evidence in its 10-K shows it? If a customer wanted to leave, what would it cost in money, time, or trouble? Has the profit margin held steady over ten years, or does it swing with every new rival? Which kind of edge is at work here, whether switching costs, a network, low cost, or an intangible asset, and could a well funded newcomer copy it? What new technology or rule might drain the moat, and have you looked for it? And finally, have you kept the question of a good business apart from the question of a fair price?