While many large law firms pursue a path of mindless growth through mergers and lateral hiring, few managing partners seem to question the wisdom of that strategy. Growth for its own sake finds protective cover in false rhetoric about serving clients. But contrary data continue to accumulate on the subject of what clients really want.

Challenging Traditional Views

Two recent articles ought to send a chill down the spine of big-law partners everywhere. The first is a recent article published on the Harvard Business Review Blog, “ Why the Law Firm Pedigree May Be a Thing of the Past.”

As their title suggests, authors Dina Wang and Firoz Dattu argue that clients are increasingly searching for value and efficiency at the expense of big law firms that rely on their brand alone to attract and retain business at premium rates.

Insofar as the authors believe that truly elite law firms may be in mortal danger, I think they overstate their case. The most sophisticated clients with the most complex problems will continue to seek top legal talent. And much of that talent will reside in elite firms committed to retaining their stature, provided they create environments that appeal to the best young lawyers.

But it’s more difficult to quibble with the authors’ survey of general counsel of 88 major companies. In matters labeled high-stakes—but not necessarily bet-the-company—roughly three out of four were less likely to use an Am Law 200 or Magic Circle firm than another firm lacking such a pedigree, provided that the firm in question achieved legal cost savings of at least 30 percent. (The article suggests that the actual cost savings in such situations could exceed 60 percent.)

Follow the Money

Couple that finding with these survey results from Counsel-Link, a LexisNexis unit: “Among the firms with 201–500 lawyers, referred to as ‘Large Enough’ firms in this report, the share of U.S. legal fees paid by clients has grown from 18 percent three years ago (July 1, 2009–June 30, 2010) to 22 percent in the trailing 12 months that ended June 30, 2013.”

So whose lunch are these “large enough” firms eating? The megafirms’: “Simultaneously, the share of U.S. legal fees paid by clients with more than 750 lawyers, the ‘Largest 50,’ has gone in the opposite direction —from 26 percent to 20 percent over the same period.”

The shift is even more dramatic when it comes to higher fee legal work, the Counsel-Link study found: “‘Large Enough’ firms have almost doubled the share of high-fee litigation matters—those matters generating outside counsel fees totaling $1 million or more (High Fee Work). ‘Large Enough’ firms grew their portion of U.S. High Fee Work from 22 percent three years ago to 41 percent in the trailing 12 months.”

Disruption as a Powerful Market Force

How are the “large enough” firms making these gains? Here’s a partial answer: “‘Large Enough’ firms billed nearly twice as much under alternative fee arrangements as did the largest 50 firms over the trailing 12 months.”

None of this should come as a surprise. For years, law firm management consultants have been saying that there are no economies of scale in the practice of law once a firm reaches about 100 attorneys. In fact, maintaining the infrastructure to support continuous expansion at the largest firms actually produces the opposite.

Embedded Interests Die Hard

Firms engaged in aggressive lateral hiring and mergers might be adding top-line revenues, but most are also adding disproportionately higher costs. According to the 2013 Hildebrandt Consulting Client Advisory, 60 percent of law firm managing partners, speaking anonymously, said their lateral hires had translated into financial success. If 40 percent are willing to admit to deploying a strategy that the survey called “break even or unsuccessful,” imagine how much worse the reality must be.

Perhaps the accumulating intelligence about clients’ actual desires and the true costs (both financial and cultural) of a strategy that prizes growth above all else will cause some managing partners pursuing such a strategy to pause. Maybe they’ll reconsider the construction of global behemoths that serve their own egos but little else. Don’t count on it.

Steven J. Harper is an adjunct professor at Northwestern University and author of “The Lawyer Bubble: A Profession in Crisis” (Basic Books, April 2013), and other books. He retired as a partner at Kirkland & Ellis in 2008, after 30 years in private practice. His blog about the legal profession, The Belly of the Beast, can be found at http://thebellyofthebeast.wordpress.com/. A version of the column above was first published on The Belly of the Beast.