What's the best way to track shifting consumer preferences in sustainable packaging?

Behavioral data is your best friend here — look at actual purchase data segmented by packaging type rather than relying on stated preferences. Conjoint analysis (especially MaxDiff) is great for forcing trade-offs between price, sustainability, and convenience, which reveals what people *actually* value vs. what they claim. Pairing that with shelf-test eye-tracking or A/B tests on e-commerce product pages will show you real decision-making in action.