Assess students' understanding of core behavioral economics principles as they apply to consumer decision-making in digital marketplaces. Scope includes heuristics and biases (anchoring, loss aversion, present bias), choice architecture and defaults, nudges and dark patterns, social proof and scarcity cues, personalization and recommender-system effects, pricing and framing. Questions require explaining mechanisms, predicting consumer responses to specific interface features, evaluating intervention effectiveness and ethical trade-offs, and applying concepts to brief real or hypothetical platform scenarios.