This study aims to distinguish the principal issues in the debate on market emulation mechanisms in difficult environments, such as those that occur in numerous areas of the Welfare State. The analysis presented may therefore be used in the future when carrying out applied studies. The research systematizes the effects of quasi-markets with respect to efficiency and equity, noting that they may be judged as advances with respect to traditional systems of assignment and those that are insecure. There is also an examination of the resources provided by other systems of regulation and procurement when the aim is to reduce or eliminate possible losses of efficiency and equity.