This paper presents a reconstruction of the legal and economic discourse of social rights. The authors aim at identifying discursive points of contact and divergence to evaluate possibilities and constraints of justiciability. In general, some guidelines are provided in order to understand and explain justification and implementation practices. Limits and restrictions to justiciability are analyzed in light of the concept of law underlining each discourse. In this respect, economic discourses adopt a pragmatic conception towards rights, whereas legal discourse sembrace an idealistic. In both cases, social rights can be consideredas nominally fundamental, without legal conditions for its enforceability. Ultimately, the possibilities to protect social rights against realities and powers entrenched in the legal system are analyzed. In this sense, the limited significance of the Social State within the fiscal sustainability framework is highlighted. As concluded, fiscal sustainability end up formalizing short-termpolicies to justify limitations on social rights justiciability.