How S. 4147 Would Make the Grocery Bill Bigger

Sixty million American households hold warehouse club memberships. They joined for one reason: buying more at once costs less per unit. The economics behind that decision are straightforward — large-volume purchases reduce per-unit production, shipping, and handling costs for suppliers, and integrated retailers pass those savings to shoppers. That mechanism is responsible for some of the most meaningful price relief available to working families in an inflationary economy.

Consumer Reports data has identified Costco as the most affordable large grocery chain in the nation, with the aggregate savings driven by the fundamental economics of bulk purchasing — leveraging massive scale to negotiate lower unit costs from suppliers and pass those savings on to members. Sam's Club, riding the same model, posted same-store sales growth of 7% in its most recent fiscal quarter as inflation-weary shoppers sought out value through scale. These are not corporate windfalls. They are the dividend of integration working as intended.

S. 4147 — the Fair Prices for Local Businesses Act, introduced in March 2026 — would expand the Robinson-Patman Act in ways that directly threaten this system. The bill would eliminate the "meeting competition" defense, make retailers legally liable for price discrimination alongside their suppliers, and presume damages for any plaintiff who proves unlawful discrimination — substantially lowering the bar for litigation. The practical effect: companies that currently negotiate volume-based pricing will face significant legal exposure for doing exactly what drives costs down.

The U.S. Chamber of Commerce has modeled the pricing dynamics clearly. Strict Robinson-Patman enforcement pushes companies to standardize prices across channels — and because the law does not require sellers to price at the lowest level, firms are at least as likely to raise prices across the board as to lower them for smaller buyers. The net effect is that consumers pay more. Restricting volume discounts does not redistribute savings to smaller competitors. It eliminates savings from the system entirely.

This is the central economic problem with S. 4147. The bill's sponsors frame it as leveling a tilted playing field. The field they are leveling is the one that allows large integrated retailers to negotiate efficiently — and to share those efficiencies with the consumer at the register. Economies of scale reduce unit costs as fixed expenses spread across volume. That advantage is genuine, it is earned through investment in infrastructure and integration, and it is the reason members experience stable low prices rather than a constantly shifting promotional environment.

The Robinson-Patman Act already prohibits genuinely predatory pricing — situations where a seller offers preferential terms to favored buyers with no cost justification and clear harm to competition. Volume discounts are explicitly recognized as a lawful cost-justification defense under the existing statute, because it costs suppliers less on a per-unit basis to serve large-volume customers. S. 4147 does not strengthen that prohibition. It dismantles the cost-justification framework that makes efficient pricing legally defensible.

The RPA has gone largely unenforced since the 1980s — a period during which warehouse clubs expanded access to low-cost goods for tens of millions of households, and during which the U.S. economy generated significant retail innovation driven by exactly the integrated, high-volume business models the bill now targets. That history should be treated as data, not coincidence.

Congress has a legitimate interest in competitive markets. Supporting competition means protecting the conditions under which American companies can invest in scale, integration, and supply chain efficiency — and deliver that investment as lower prices to consumers. S. 4147 moves in the opposite direction. It introduces litigation risk around the core commercial practices that make affordability possible, raises costs for the retailers that have built their entire value proposition around passing savings to members, and does so without evidence that the targeted practices produce consumer harm.

AGIF urges the Senate Judiciary Committee to reject this legislation. The American families who depend on warehouse clubs to stretch their grocery budgets did not ask for this protection. They asked for lower prices. Scale delivers that. This bill takes it away.

The American Growth & Innovation Forum is a research and advocacy organization that advances fact-based policy supporting American enterprise, economic growth, and consumer access.