A growing proportion of clinical research funded by pharmaceutical companies, high-income country research agencies, and not-for-profit funders is conducted in low- and middle-income settings. Disparities in wealth and access to healthcare between the populations where new interventions are often tested and those where many of them are ultimately marketed raise concerns about exploitation. This chapter examines several ethical requirements frequently advanced as mechanisms for protecting research subjects in underserved communities from exploitation and evaluates the effectiveness of those mechanisms as responses (...) to exploitation worries. It goes on to highlight where the conceptual frameworks relied upon by research ethicists must be improved if we are to fully understand the nature of the moral claims and obligations that arise in research conducted in underserved communities. (shrink)