Question: Do profits improve when firms attempt to gain market share?

If you believe in the common wisdom of students, managers, and professors of marketing, the answer would be “yes.” However, the evidence tells a different story.

Fred Collopy and I summarized prior research consisting of nearly 30 previously published empirical studies. Twenty-three different laboratory experiments were conducted with 43 groups spaced over many years and countries. In addition, we analyzed 54 years of field data for 20 companies to compare companies that used market share as an objective versus those that focused only on profits. Our research extended over a decade. The results from all approaches showed that market-share objectives harmed profits and put the survival of firms at risk (Armstrong and Collopy 1996).

The paper was difficult to publish. Reviewers disagreed with our findings and seemed intent on blocking publication. They kept finding what they thought to be serious problems with the research. When we would respond to their criticisms with additional experiments, they became incensed. In all, it took about five years to get through the review process. In the end, an editor over-ruled the reviewers.

In a follow-up paper, Kesten Green and I described new evidence from 12 studies that were conducted since the 1996 publication. The new evidence provided further support for the conclusion that competitor-oriented objectives are harmful. In fact, there has been no empirical evidence to date to challenge this conclusion.

While our research has received much attention (e.g., 138 citations for the 1996 paper), it seems to have had little effect on what is learned in business schools.

In teaching the introductory marketing class to Wharton MBAs, I would present the results of this research. This proved to be upsetting to many students as it conflicted with their beliefs and with what they said they were learning in other courses. After one session in which I described this research, an MBA class representative came to me with the “friendly advice” that the students did not appreciate hearing about my research; they would prefer to know what is going on in the real world.


Armstrong, J.S and K. C. Green, “Competitor-oriented Objectives: The Myth of Market Share,” International Journal of Business, 12 (2007), 117-136.

Armstrong, J.S. and F. Collopy (1996), “Competitor Orientation: Effects of Objectives and Information on Managerial Decisions and Profitability,” Journal of Marketing Research, 33 (1996), 188-199.

Shubik, M. (1971), “The Dollar Auction game: A paradox in noncooperative behavior and escalation,” Journal of Conflict Resolution, 15, 109-111.