Organs available for transplantation are scarce and valuable medical r
esources and decisions about who is to receive them should not be made
more difficult by complicated calculations of desert. Consideration o
f likely clinical outcome must always take priority when allocating su
ch a precious resource otherwise there is a danger of wasting that res
ource. However, desert may be a relevant concern in decision-making wh
ere the clinical risk is identical between two or more potential recip
ients of organs. Unlikely as this scenario is,such a decision procedur
e makes clear the interdependence of organ recipient and organ donor a
nd hints at potential disadvantages for those who are willing to accep
t but unwilling to donate organs (free-riders). A combined opting-out
and preference system weakens many of the objections to opting-out sys
tems and may make the decision to donate organs on behalf of their dec
eased relatives easier for families.