Choose the answer that best defines the marginal propensity to save (MPS). a. The slope of the consumption function b. The share of all income earned that is not devoted to consumption c. The share of all income earned that is devoted to saving rather than consumption d. The share of each additional dollar of income earned that is devoted to saving rather than consumption e. The sum of all saving from all people in the economy f. The change in saving when workers become unemployed