Conjoint analysis often includes a no-choice option allowing respondents to opt out and not make a purchase. We evaluate a dual-response format in which respondents first select their preferred option excluding the no-choice alternative, then decide whether they would actually purchase it. Results show that respondents apply budget constraints only in the second response, separating affordability from preference. The dual-response model improves parameter estimation efficiency by 30% and corrects overestimated equilibrium prices in competitive market simulations.
