What is the last technology product you purchased that never declined in price after you bought it?  If you answered your broadband service, a new study proves you right.

Since there are no public data on what has happened to broadband prices over the last decade, Shane Greenstein, a professor of management and strategy at the Kellogg School of Management, and his co-author Ryan McDevitt, an assistant professor of economics and management at the University of Rochester and a graduate of Northwestern University, analyzed the contracts of 1,500 DSL and cable service providers from 2004 to 2009.

The results every broadband user already knows.

At best, prices have declined only slightly — typically between 3-10 percent, partly from a “quality adjustment” the authors included to account for gradually increased broadband speeds when measuring prices.

Greenstein blames a broadband duopoly for the stagnation in broadband pricing.

Greenstein

“So if you were in such a market as a supplier, why would you initiate a price war?” Greenstein asks. With no new entries on the market, suppliers can compete by slowly increasing quality but keeping prices the same. According to Greenstein, quality is where providers channel their competitive urges.

Meanwhile, once companies have installed the lines, their costs are far below prices. “At that point, it becomes pure profit,” Greenstein says. A company might spend around $100 per year to “maintain and service” the connection, but people are paying nearly that amount every other month. Greenstein says that it is not surprising that prices were high during the buildout phase in the early and mid-2000s, since the firms were trying to recover their costs. “However, we are approaching the end of the first buildout, so competitive pressures should have led to price drops by now, if there are any. Like many observers, I expected to see prices drop by now, and I am surprised they have not.”

The authors also confirm Stop the Cap!‘s long-standing contention that providers are enjoying dramatically reduced costs to deliver broadband to customers, yet are not spending some of those profits on important network upgrades.  That could lead to a broadband bottleneck, Greenstein contends, especially with the growth of online video.  We argue it is a recipe for Internet Overcharging — triggering increased pricing to “pay for upgrades” while limiting usage of broadband service, despite the mountain of profits available today to cope with usage growth.

McDevitt

Greenstein and McDevitt pored over 1,500 broadband contracts over several years, tracking pricing, service bundling, and speed improvements.  Pricing, adjusted for speed improvements, was generally flat.  Because the cable industry has delivered most of the speed growth Americans enjoy, the “quality adjustment” the authors used credited most of the modest price declines to the cable industry, especially for customers moving to bundled packages of services.  The authors found DSL and its providers almost completely stagnant — both in pricing and speed.

The most surprising discovery, Greenstein says, is that national decisions are being made without the type of data that he created in the consumer price index. “As an observer of communications policy in the U.S., I find it shocking sometimes how often government makes decisions by the seat of their pants,” he says. Without real data and statistics, decisions are based solely on who has better arguments—in essence, a debate. A better consumer price index will help produce better decisions for the future of the Internet and its users.

It may also serve as an effective challenge to telecommunications industry lobbyists who engineer their own statistics and claims about the performance of the nation’s phone and cable companies.

Thanks to Stop the Cap! readers Bones and Michael for sending along the story.