The development of medical knowledge has resulted in a demand in socie
ty for donor organs, but the recruitment of donor organs for transplan
tation is difficult. This paper aims to provide some general insights
into the complex interaction processes involved. A laissez-faire polic
y, in which market forces are relied on, is not acceptable from an eth
ical and legal point of view in most western European countries. Espec
ially at the demand side of the exchange of donor organs, commercialis
m is to be opposed. We judge the use of commercial incentives at the s
upply side less unacceptable in theory but not feasible in western Eur
opean countries. Since market forces are deemed unacceptable as instru
ments for coordinating demand and supply of donor organs, donor procur
ement has to be considered as a collective good, and therefore governm
ents are faced with the responsibility of making sure that alternative
interaction and distribution mechanisms function. The role of organ p
rocurement agencies (OPAs) in societal interaction concerning postmort
em organ donation is described using a two-dimensional conceptualisati
on scheme. Medical aspects of living organ donation are described. An
international comparative description of legal systems to regulate liv
ing organ donation in western European countries completes this survey
.