Recognising that offers of payment to research participants can serve various purposes—reimbursement, compensation and incentive—helps uncover differences between participants, which can justify differential payment of participants within the same study. Participants with different study-related expenses will need different amounts of reimbursement to be restored to their preparticipation financial baseline. Differential compensation can be acceptable when some research participants commit more time or assume greater burdens than others, or if inter-site differences affect the value of compensation. Finally, it may be permissible (...) to offer differential incentive payments if necessary to advance the goals of a study. We encourage investigators and Institutional Review Boards to think about whether to offer payment, in what amounts and for what purpose, and also to consider whether differential payment can help promote the scientific and ethical goals of clinical research. (shrink)

Luke Semrau argues that the documented harms of existing organ markets do not undermine the case for establishing regulated systems of paid kidney donation. He offers two arguments in support of this conclusion. First, Semrau argues that the harms of kidney selling are straightforwardly amenable to regulatory solution. Second, Semrau argues that even in existing black markets, sellers would likely have experienced greater harm if the option of selling a kidney were not available. This commentary challenges both of Semrau’s claims. (...) I argue that there is no reason to believe that kidney sellers benefit from the current black market trade in organs, and highlight a number of potential issues regarding the effectiveness and feasibility of Semrau’s proposed market regulations. (shrink)