Competing Inferences from Consumer Behavior: Evaluating Empirical Evidence in Privacy Disputes

Ceren Canal Aruoba argues that consumer behavior evidence is essential in privacy litigation, but courts must be careful not to draw overly broad conclusions from observed consumer actions. Accepting cookies, sharing personal information, or continuing to use a digital service does not automatically reveal what consumers understood, valued, or intended. The same behavior can result from different motivations, making empirical evidence crucial for distinguishing among competing explanations.

Ms. Canal Aruoba organized the evaluation around four questions:

• How do consumers make decisions?
• What do they value?
• What do they believe or understand?
• Whether a challenged practice caused a change in behavior?

Ms. Canal Aruoba explains that different research methods (e.g., surveys, experiments, analyses of marketplace data) are suited to different types of inferences. She describes how experiments may help identify how interface design affects decisions, surveys may measure consumer understanding of privacy practices, and causal analyses are needed to determine whether a disclosure or design change altered consumer behavior.

Ms. Canal Aruoba concludes that consumer conduct is not self-explanatory; the value of empirical evidence lies in its ability to distinguish among competing interpretations of the same observed behavior and provide the most reliable basis for determining which observations are supported by the facts.