Selling Consumer Data: Why the Mechanism Matters for Competition and Privacy?
Competition and privacy in the digital economy are shaped by data intermediaries, firms that collect and sell consumer information. Our recent study published in the International Journal of Industrial Organization, “Collecting and Selling Consumer Information: Selling Mechanisms Matter”, uncovers a fundamental insight: the way these firms sell consumer data, i.e., the selling mechanism, directly influences both competition and privacy protection.
Data intermediaries primarily use two distinct mechanisms to sell consumer information: take-it-or-leave-it offers and auctions. Each mechanism generates significantly different economic and welfare outcomes that demand careful consideration. Take-it-or-leave-it offers enhance competition and benefit consumers but can lead to excessive data collection. On the contrary, auctions protect privacy at the cost of reduced market competition. This apparent trade-off can be resolved through coordinated regulations that balance market competitiveness and privacy protection.
Two Selling Mechanisms, Two Outcomes: Competition vs. Privacy
When intermediaries employ take-it-or-leave-it offers, they sell the similar datasets to competing firms. This possibility intensifies competition as companies leverage detailed consumer profiles to compete more aggressively on prices and quality. This results in higher consumer surplus, with more competitive prices for consumers. However, this mechanism also creates strong incentives for intermediaries to collect ever-growing volumes of consumer data. More granular data increases the ability of firms to extract surplus from consumers, leading to over-collection of personal information and raising privacy concerns.
Auctions represent a fundamentally different approach. In equilibrium, the intermediary optimally sells data to a single firm. This reduces incentives to collect large amounts of data and therefore leads to fewer data collected and stronger privacy protection. Yet, this exclusive sale of data also weakens competition in the product market: with only one informed firm, the competitive pressure is reduced, leading to higher prices for consumers.
Hence, we highlight a new trade-off. Under take-it-or-leave-it offers, intermediaries collect substantially more consumer data, consumers benefit from lower prices, but their privacy is reduced as firms gain deeper insights into individual behavior. Auctions reverse this dynamic: by restricting data sales to one firm, auctions limit the incentives to collect data, thereby improving privacy, but softening competition.
The Benefits of Joint Regulation
The solution to this trade-off hinges on coordinated regulation. Two complementary regulatory tools show particular promise. Data minimization rules, implemented in the European GDPR, already limit how much consumer data firms can collect. By enforcing strict data minimization, especially for intermediaries using take-it-or-leave-it offers, regulators can curb excessive data collection while maintaining the competitive benefits of this selling mechanism. Consumers continue to enjoy lower prices and better choices with significantly reduced privacy risks.
Fair, Reasonable, and Non-Discriminatory data-access regimes offer another powerful regulatory solution. FRAND rules ensure that all firms have equal access to consumer data, preventing exclusive deals where a single company gains unfair advantages through exclusive data access. Under data-centered FRAND regulations, competition intensifies as more firms have access to data and compete on a level playing field. This sustains high consumer surplus by preventing intermediaries to over-collect data.
The Way Forward
Data intermediaries are becoming increasingly pivotal in a fast-growing digital economy. Their selling strategies shape not only how firms compete, but also how much personal data is collected. Effective policies must simultaneously protect privacy and preserve market competition — not as competing goals, but as a joint coordinated effort.