Ne ie cycle hypothesis on consumption behavior suggests that people at various stages of the life cycle (1) spend everything they earn so saving ends up at zero

ne ie cycle hypothesis on consumption behavior suggests that people at various stages of the life cycle (1) spend everything they earn so saving ends up at zero (2) increase their marginal propensity to consume as income increases 3) decrease their marginal propensity to consume as income increases (4) have differing MPCs, which is still consistent with a constant MPC for the economy