This article examines empirical evidence on the impact of the introduction
of a quasi-market in healthcare in the UK an professionals, especially doct
ors. Data are drawn from two longitudinal studies occurring between 1990 an
d 1994, of aspects of the changes to the health system. Data collection inv
olved a range of methods, including observation, interviews, questionnaires
and archival material. The findings show that a unilateral analysis of the
impact of the quasi-market on professionals is inadequate to understand th
e situation. The responses of the professionals to change have had a major
influence on the outcomes. Professionals have not uniformly lost power, som
e have gained considerably. Explanations of the variance of impact and the
substantial power shifts have to take account of a range of contextual fact
ors. The market has not had a major impact on the technical autonomy of the
doctors. Consequential structural changes have produced a new category of
professional managers who are actively managing their colleagues' performan
ce.