RT Journal Article T1 Adding an informal sector to the IS-LM framework: A graphical exposition of the IS-LM-PC-SE model for the classroom and policymaker A1 Costa Junior, Celso José A1 García-Cintado, Alejandro K1 Undergraduate macroeconomics K1 Nonspecialists K1 Fiscal policy K1 Fiscal adjustments K1 Shadow economy K1 Tax evasion AB Economic policies have been shown to affect the macroeconomy in a different fashion when a sizeable shadow economy is explicitly taken into account. But, in spite of its seemingly high relevance, no intermediate-Macroeconomics textbook posits a discussion on this topic. In this paper, we seek to make a contribution by extending an otherwise conventional IS-MR-PC model along the same lines of the approach used in Blanchard’s highly acclaimed textbook (Blanchard, 2016a) to include an informal sector. We find that this two-sector model is capable of qualitatively reproducing the main basic results obtained in this literature. Therefore, importantly, this work provides a toolkit intended for undergraduate students, practitioners, policymakers, and, in general, nonspecialists on the cost-benefit analysis of economic policies in the presence of a significant underground economy. PB Elsevier YR 2024 FD 2024-06-01 LK https://hdl.handle.net/10433/20922 UL https://hdl.handle.net/10433/20922 LA en NO Economic Systems Volume 48, Issue 2, June 2024, 101225 NO Universidad Pablo de Olavide. Departamento de Economía, Métodos Cuantitativos e Historia Económica DS RIO RD May 24, 2026