There was a time when a quick estimate of market shares might have been enough to provide a reasonable assessment of antitrust risk for a potential combination between two brick and mortar retail chain stores.

Not anymore.

The playbook for evaluating competitive concerns from a potential combination of two brick and mortar retailers has evolved considerably. In recent years, the Federal Trade Commission (FTC) has reviewed proposed transactions between well-known retailers, including Office Depot/OfficeMax (2013), Dollar Tree/Family Dollar (2015), Albertsons/Safeway (2015), Walgreens/Rite Aid (2017), Bass Pro Shops/Cabela’s (2017), and 7-Eleven/Sunoco (2018). Public statements from recent transactions investigated by the FTC confirm that the agency is using more sophisticated data-driven tools during investigations with important implications for future deal activity.

As the tools used by the U.S. antitrust enforcement agencies have evolved, so too must the tools used to gauge antitrust risk at the pre-deal stage. These risks include the potential for a long and costly antitrust investigation, including compliance with a Second Request (a giant subpoena for documents, data, and other information from the merging parties), the potential that divestitures may be required to resolve competitive concerns raised by the agency, as well as the possibility that the agency may seek to block the transaction entirely.

That’s why brick and mortar retailers contemplating a merger need to adjust their thinking about pre-deal risk assessment. A modern approach to retail M&A involves five key areas, including:


Consumer substitution patterns—not market shares—are central to assessing the antitrust risk of a potential retail merger. In an investigation, the FTC is trying to figure out whether the consolidation will “substantially lessen competition.” Naturally, a key aspect of answering that question is to determine how closely the two retailers compete with one another. Closeness of competition is evaluated along a variety of dimensions, including geographic proximity as well as similarities in pricing, promotion, and product assortment. The closer two retailers are along these dimensions, the more likely it is that the FTC will conclude that consumers view them as close substitutes.

A before/after analysis is a standard practice at the antitrust agencies for assessing customer substitution patterns and whether the proposed transaction is likely to give rise to competitive concerns. One of the most common types of before/after analysis used by the FTC is to compare the parties’ store-level sales before and after a competitor store opens nearby. In undertaking this type of analysis, the agency is attempting to develop evidence to answer questions related to consumer substitution patterns, such as: How big of a hit to sales does the store suffer when a competitor store opens nearby? Is the hit to sales from entry bigger for some categories of products than others? Is the hit to sales bigger when one specific competitor (e.g., one of the parties to the proposed transaction) enters compared to other competitors?

In general, if the hit to sales from entry by a variety of competitors are all similar, then it is more likely the agency will conclude that consumers do not view the parties to the proposed transaction as particularly unique or especially close substitutes in the marketplace. The same is true if the hit to sales from the entry is small.

In a FTC merger review, the impact on sales from a competitor’s entry are translated into consumer substitution patterns, which are referred to, in antitrust jargon, as “diversions” or “diversion ratios.” The amount—and value—of that diversion provides a numerical measure used by the FTC to assess how closely the parties to the proposed transaction compete. The agency views “high” diversion ratios as indicating that those two retail chains are close competitive alternatives for consumers. Consequently, antitrust risk typically increases if the FTC, using its own analytical framework, would likely find high diversion ratios between the parties to the proposed transaction.

Evidence about the extent of customers’ cross-shopping across multiple retailers is also useful, but must be interpreted with care. While cross-shopping often reflects consumers’ ability and willingness to substitute purchases of the same goods across different retailers, such cross-shopping could well reflect that consumers satisfy different needs at different retailers or through different channels of sale.


Online sales as a percentage of overall retail sales continues to grow significantly. Few brick and mortar retailers have escaped at least some competitive pressure from e-commerce retailers. The constraint from online retailers, however, is not the same in every retail setting. Nearly everyone buys online these days, but not everyone considers buying everything online all the time—or even most of the time for certain types of retail purchases.

That has implications for the antitrust analysis of retail mergers. In some retail settings, like the retail sale of office supplies (Office Depot/OfficeMax) and children’s toys (Toys ‘R Us), the FTC has credited online competition as a constraint on brick and mortar retailers. But in other retail settings, like the sale of tailored men’s suits (Jos. A Bank/Men’s Wearhouse) and supermarkets (e.g., Albertsons/Safeway, Ahold/Delhaize), the FTC has not viewed online retailers as a significant constraint on brick and mortar retailers despite the growth of online sales. Therefore, determining how much credit the antitrust agency is likely to give online retail competition is critical.


Understanding the business rationale for the choice of pricing strategy is a central issue in the antitrust agency’s competitive assessment of a proposed transaction. While zone-level or store-level pricing may be driven by differences in costs to serve, the FTC typically considers prices, pricing policies, and price zones that vary locally based on the presence or absence of key competitors to be a major factor in their antitrust analysis. A price zone allowing for higher prices when a competitor (or type of competitor) is absent, or lower prices when the competitor is present, is likely to affect how the agency defines the relevant set of competitors and is almost always a critical factor in the agency’s ultimate assessment of the competitive effects of the merger itself.

National and omnichannel pricing—in which prices and promotions do not vary across stores, e-commerce, and hardcopy mailings such as catalogs—may mean there are different competitive constraints compared to localized pricing strategies. Indeed, it is not uncommon for parties to a proposed transaction to point to their national-pricing policies to explain why the transaction will not change pricing in any local area where the parties both have stores. But even here, the reason for the choice matters.

National pricing may be driven by a desire to provide a singular experience because many consumers purchase across multiple stores and through multiple channels—both in-store and online. A decision to use national pricing may also be driven by vigorous competition from omnipresent e-commerce alternatives. National pricing may also stem from vigorous competition from thousands of diverse mom-and-pop retailers across the country. Those are benign to affirmatively helpful facts for parties that propose to merge.

National pricing, however, is not a silver bullet. If the reason for national pricing is that the other party to the transaction has a nationwide, or nearly nationwide, footprint of stores, making nationwide pricing an efficient way to price against that key competitor, national pricing may raise antitrust scrutiny.


The ability to lower costs often motivates a potential combination. That’s almost always a good thing because it is important to be able to articulate a strong pro-competitive rationale for the proposed transaction. The focus of the antitrust agency’s investigation is not on how the consolidation will benefit the merging parties, but rather: “How will the transaction benefit consumers?” A merger premised on lowering costs and passing those savings on to consumers through lower prices is viewed favorably by the FTC.

But not all synergies are inevitably pro-competitive. While cost synergies are often viewed as pro-competitive, synergies that stem from transaction-related store closures can create a red flag.


One thing that has not changed over time is the use of the traditional investigation tools and types of evidence. In retail merger investigations, these include: documents discussing competition and efficiencies that are submitted with the merging parties’ premerger notification Hart-Scott-Rodino filings; interviews of competitors of the merging parties and other industry participants; and the merging parties’ ordinary-course documents focusing on how the merging parties assess competition, their competitors, and, yes, their market shares.

The five areas described here represent a modern, pre-transaction risk assessment approach that is aligned with the analytical tools the antitrust agencies rely on when reviewing a merger. The tools described here play a key role in assessing internally the competitive issues that may arise during the antitrust merger-review process and that affect the ultimate outcome of that review.

This original version of this article appeared in Retail Leader.