“…By focusing on the 'zero-sum' dilemma faced by coverage decision makers, and not including these options in surveys aimed at measuring the societal value of treating rare diseases, scholars risk informing the policy debate with estimates of societal preferences that do not take into account the full range of resource allocation options available to the polity as a whole, thus calling into question the very purpose of citizen participation, which is to increase the democratic legitimacy of decisions with distributive consequences [4,5]. Moreover, the value conflict instigated by 'zero-sum' frames is likely to lead to increased rates of choice avoidance and preference instability since respondents will tend to seek out alternative options that are not included in the choice sets presented to them.…”