The marginal propensity to save is defined as: / » Micro Economics 1 solved MCQs / By admin Question: The marginal propensity to save is defined as: A. 1-∆C/∆Y B. S/Y C. Y/S D. Y/∆S Answer» a. 1-∆C/∆Y Note: The above multiple-choice question is for all general and Competitive Exams in India.