We propose a clarification of the notion of a soft budget constraint, a concept widely used in the analysis of socialist, transitional, and market economies. Our interpretation is broad enough to embrace most existing approaches to soft budget constraint phenomena and provides a classification of their causes and consequences. In light of this interpretation, we then review the theoretical literature on the subject and compare it with those on other dynamic commitment problems in economics.

The article deals with the phenomenon of the soft budget constraint (SBC). Though originally it was formulated to illuminate economic behavior in socialist economies, this concept is increasingly acknowledged to be pertinent well beyond their realm. The authors have two main objectives: conceptual clarification and survey of formal theoretical literature on SBC. In the first part of the article the accent is made on analyzing the essence of the SBC syndrome, means of its softening and corresponding expectations of organizations. Formal models of SBC in socialist and transition economies are also analyzed.