BUSI 620 Week 4 DB Forum 4 Example

Discussion Board Forum 4: The Nature of Industry and Market Structures

BUSI 620 Global Economic Environment, Discussion Board Forum 4 (thread and 1 reply)

Thread by [Student Name]

The forum questions, the industry example and the classmate's thread are composites standing in for the course's own; the research cited is real, and the requirements follow Liberty's public course guide for BUSI 620.

Thread

Chapter 7 of Baye and Prince (2017) gives two common measures of industry structure. The four-firm concentration ratio adds the market shares of the four largest firms, and the Herfindahl-Hirschman index (HHI) adds the squared shares of every firm, using whole percentages, so it ranges up to 10,000 for a monopoly. Consider a composite regional market for ready-mix concrete with four suppliers.

The concentration ratio is 100, since four firms hold the whole market, and the HHI is 3,000. The HHI says more: because it squares shares, it rises when one firm is much larger than the others, so a market split 25-25-25-25 would have the same ratio but an HHI of only 2,500. Neither measure is perfect. Both depend on how the market is defined, and both ignore competition from imports or substitutes.

Does concentration matter for profits? Chapter 8 predicts that firms with market power price above marginal cost, while competitive firms cannot. Grullon et al. (2019) found that since the late 1990s more than 75 percent of U.S. industries became more concentrated, and that firms in the industries with the largest increases earned higher profit margins and made more profitable acquisitions, with no clear evidence of greater operating efficiency. They concluded that market power had become an important source of value. If margins rise with concentration but efficiency does not, the extra profit is coming from customers, not from better operations.

For managers, the finding has two sides. A firm in a consolidating industry may enjoy wider margins, but it also faces more antitrust attention to its acquisitions, and its customers have reason to look for new entrants or substitutes. In ready-mix concrete, where trucks can haul only so far before the product sets, the relevant market really is local, which is why a regional HHI tells a manager more than a national one would. A contractor facing a 3,000 HHI has few alternatives, and a supplier in that market should expect large buyers to sign long-term contracts or invest in their own batch plants to escape it.

Reply to Leah

Leah, your thread described a local coffee shop that earned strong profits in its first two years by offering seasonal drinks no one else in town sold. That fits monopolistic competition well: many sellers, differentiated products and some control over price (Baye & Prince, 2017).

The chapter's long-run prediction is the hard part for the owner. With free entry, profits attract imitators, each new shop takes some customers, and the original shop's demand curve shifts left until economic profit approaches zero. The seasonal drinks are easy to copy, so the advantage will fade. The textbook's answer is continual differentiation, such as a loyalty program or a roasting partnership competitors cannot easily match. One complication is that the shop's location may be harder to copy than its menu. If it sits on the only walkable corner near a college campus, part of its profit is really a return on that location, which entrants cannot replicate, and that portion may survive entry. Did the shop's profits actually fall once competitors added similar drinks, or did the location keep its customers coming?

References

Baye, M. R., & Prince, J. T. (2017). Managerial economics and business strategy (9th ed.). McGraw-Hill Education.

Grullon, G., Larkin, Y., & Michaely, R. (2019). Are US industries becoming more concentrated? Review of Finance, 23(4), 697-743. https://doi.org/10.1093/rof/rfz007