The Privacy Paradox of Competition and Opt-Outs

Competition and the right to reject tracking sound like straightforward protections against personalized pricing. The subject here is more specific: how rivalry and consumer-control regulation change a firm’s commitment problem. The reported economic model shows why a policy can improve a buyer’s immediate outside option while also making tracking and personalized pricing easier for firms to adopt.

The result is counterintuitive only if “more competition,” “more choice,” and “more privacy” are treated as the same outcome. They are not. A firm can adopt tracking more widely, an individual can remain untracked, and the welfare effect can still be unresolved. To read the model carefully, we need to keep those outcomes separate.

Rivalry Can Make Personalized Pricing Easier to Sustain

In a monopoly, one seller controls the buyer’s relationship. If the seller learns that a buyer is likely to accept a high price, the seller may want to use that information to capture more of the available surplus. A privacy-sensitive buyer anticipates the incentive. If the buyer expects the personalized offer to leave them with negative net surplus, they may refuse to participate even if the underlying product is attractive.

That is the commitment problem introduced earlier. The seller may want the buyer to believe that data will improve the exchange, but once the data are available the seller has a reason to use them more aggressively. In a monopoly, the buyer does not have a rival seller inside the same model to discipline that decision. The possibility of losing the buyer is the main constraint.

The reported model changes the market structure from monopoly to duopoly. In a duopoly, rival firms compete for the buyer. The abstract’s explanation is that the rivals undercut one another’s prices, which alleviates the commitment problem. Competition gives the buyer another offer against which a personalized price can be judged. That pressure can make the data-based offer less damaging to participation, even though the firms are still using tracking and personalized pricing.

The important conclusion is not that competition makes every personalized price lower. It is that competition changes the seller’s credibility. When a buyer can switch to a rival, a firm has less freedom to promise a favorable deal and then quietly take all the surplus. The rival’s possible offer becomes part of the buyer’s outside option, and that outside option can support wider use of personalized pricing in the reported equilibrium.

This creates a distinction between the level of a price and the adoption of a pricing technology. A competitive market might produce a lower offer for some buyers because firms undercut one another, while also giving firms stronger incentives to invest in tracking. A firm’s adoption of the technology is an industry-level outcome. The price and exposure experienced by one buyer are consumer-level outcomes. Neither can stand in for the other.

A small hypothetical shows why. Suppose two firms sell comparable products. Each would like to charge more to a buyer whose data suggest high willingness to pay. If either firm charges too much, the buyer can take the rival’s offer.