We acknowledge that there are serious gaps in the current evidence base, and we recognise too, that those in the UK who call for the introduction of financial incentives do so out of a genuine concern for the welfare of those waiting for an organ transplant. However, we suggest that, in a situation where there is a strong international consensus as to the importance of the current solidarity-based system in protecting both individual donors and the common good, an approach of 'precautionary thinking' is demanded: the burden of proof of the benefits of an alternative system must fall on.
