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Warren Buffett once said, "When an industry with a reputation for difficult economics meets a manager with a reputation for excellence, it is usually the industry that keeps its reputation intact."

That wisdom could prove particularly useful for investors eyeing homebuilder stocks.

The lesson is that the industry in which a business operates dictates much of the company's profit potential. And when competition is intense, profitability is destroyed.

That's exactly what is happening with homebuilder companies today. Supply exceeds demand, and the aggressive price-cutting of homes from big builders such as


(LEN) - Get Lennar Corporation Class A Report

will eventually cause serious ripple effects among rivals.

Lately, builder stocks have rebounded on hopes that the worst is over for the companies. But one method of analysis provides a healthy dose of reality about the dire situation the homebuilding industry is still facing.

The "Five Forces Framework," a method developed by Harvard economist Michael Porter in the mid-1970s, is widely taught in MBA programs and used by corporate strategists.

It's also a powerful tool for investors to use when deciding whether to buy stocks in a certain sector, and it highlights issues that will continue to erode profitability for homebuilders.

Force One: Degree of Rivalry

Rivalry among companies is one of the most obvious forces in an industry. "It influences the extent to which the value created by an industry will be dissipated through direct competition," writes Harvard Business School Professor Pankaj Ghemawat in his book

Strategy and the Business Landscape

, which outlines Porter's framework.

There is no doubt that homebuilders created a lot of value in recent years when the housing boom was rampant. Now, however, the rivalry is intense. The result is shrinking home prices and eroding profitability.

Lennar remains the biggest bully in many markets, cutting prices and aggravating fellow builders such as


TheStreet Recommends

(MTH) - Get Meritage Homes Corporation Report




, which are trying to hold prices and margins steady.

Lennar announced this week that

orders were down 6% in its latest quarter, but its backlog of homes fell 42% year over year in dollar terms.

JMP Securities analyst Alex Barron says those numbers imply the prices of Lennar's new orders fell at least 30%.

"If that is remotely true, I don't see how or why any builder -- public or private -- will just sit there and not eventually have to begin cutting prices down to match or beat that," Barron says.

The only real way to hold steady on prices in such a market is to offer a differentiated product. But with the exception of luxury-home builder

Toll Brothers

(TOL) - Get Toll Brothers, Inc. Report

, it's hard to say any builder has an edge on product.

If you travel around the country, you'll find Lennar's homes similar to those of

D.R. Horton

(DHI) - Get D.R. Horton, Inc. Report



(BZH) - Get Beazer Homes USA, Inc. Report

, Ryland and other builders, Barron says.

"There is not a huge noticeable difference from one to the next," he says.

Force Two: Threat of Entry

In an ideal situation, companies compete in an industry where it's difficult for new rivals to enter.

One of the reasons that builders trade above book value these days is that investors believe the land that the firms have amassed is worth something and cannot easily be replaced. Thus, perhaps entry barriers are high.

Toll Brothers is called a great company for the long haul -- even by hedge fund managers who are bearish about the sector right now -- because the firm controls land that it has entitled in areas of the country where new development is difficult.

However, the problem for all builders, including Toll, is that they

bought too much land in recent years, and the value of the land is now being written down. Lennar is forecasting $400 million to $500 million of land writedowns in the fourth quarter.

The threat of entry may be low right now, but then again, the current housing inventory levels are already so high that any barriers to entry aren't helping.

Force Three: Threat of Substitutes

Right now, buyers are faced with two main substitutes for a new home: buying an existing home or finding a rental.

During the housing boom, demand for new homes shot up at enormous rates, partly driven by flippers and speculators who purchased several homes, often within the same community while it was in its "preconstruction" phase.

Today, customers have a lot of options, and the threat of substitutes remains high for builders. There is a glut of existing-home inventories, and rental apartments and houses are often more affordable across the country. In some communities, builders selling new homes are facing competition within their existing communities from buyers looking to sell a version of an identical home purchased a year ago.

All of these substitutes obviously hurt builders with their pricing power.

Force Four: Buyer Power

Buyer power "allows customers to squeeze industry margins by compelling competitors to either reduce prices or raise the level of service offered without recompense," Ghemawat, the Harvard professor, writes in his book.

Open up a newspaper in Florida and California and you'll see builders offering price cuts and incentive deals to move a home.

In short, buyer power is huge right now in most markets, and customers are exerting this influence -- sometimes by just waiting on the sidelines until a deal emerges.

Force Five: Supplier Power

Here is the one area where builders might have some advantage right now. Barron, the JMP analyst, says several homebuilder management teams have talked about extracting 5% price cuts from certain material suppliers.

Then again, if housing prices are dropping 30% on new orders -- like at Lennar -- that gain doesn't help much, he says.

Even if material costs drop, land costs remain a huge piece of the puzzle that builders will have trouble controlling.

So as a whole, the homebuilding industry is facing intense competition, strong buyer power and the high threat of substitutes (such as rental apartments and existing-home inventories).

As an investor, ask yourself if this looks like an attractive industry to be in now. has a revenue-sharing relationship with under which it receives a portion of the revenue from Amazon purchases by customers directed there from