Locked Out by Loyalty: Entry Deterrence Through Rebates in Payment Card Markets

Why It Matters

Rebates that deter competition inflate merchant fees and cement market concentration, prompting policymakers to reconsider antitrust and payment‑system regulation.

Key Takeaways

• Incumbents offer high rebates to banks to block rivals
• Larger consumer benefits amplify rebate‑based entry deterrence
• Deterrence raises merchant fees in two‑sided card markets
• Switching costs for issuers increase network lock‑in
• Regulation may need to address rebate‑driven concentration

Pulse Analysis

Payment‑card ecosystems are classic two‑sided platforms, linking merchants with issuing banks and, ultimately, cardholders. The paper highlights how dominant networks leverage rebates—cash or fee credits paid to banks—to make their cards more attractive to issuers. By inflating these rebates when consumer transaction benefits grow, incumbents create a financial moat that discourages new networks from entering, even if the latter could offer innovative services. This strategy shifts the competitive balance away from price competition toward fee extraction, especially on the merchant side, where fees rise as a by‑product of the deterrence.

The mechanics of rebate‑driven deterrence hinge on two forces. First, higher consumer benefits, such as cash‑back or rewards, increase the perceived value of the incumbent’s card, prompting banks to favor it and pass rebates to cardholders. Second, banks face switching costs—technology integration, brand alignment, and contractual penalties—that make moving to a new network costly. Together, these factors raise the effective entry barrier, allowing incumbents to sustain higher merchant discount rates. Empirical evidence from the study suggests that merchant fees can climb substantially in markets where rebate levels are aggressively used, contradicting the intuition that competition always lowers prices.

For regulators, the findings raise red flags about the health of payment‑card markets. Traditional antitrust tools focus on entry costs like infrastructure investment, but may overlook rebate strategies that subtly lock in banks and inflate merchant fees. Policymakers could consider transparency mandates on rebate arrangements, caps on merchant discount rates, or incentives for alternative payment networks. As digital wallets and fintech platforms seek footholds, understanding and curbing rebate‑based entry deterrence will be crucial to fostering a more competitive and cost‑effective payments landscape.