PSYCHOLOGICAL LAW: A principle of consumption behavior proposed by John Maynard Keynes stating that people have the propensity to spend a large fraction, but not all, of any additional income received. This psychological law is a key principle reflected in the consumption-income relation and the marginal propensity to consume that underlie Keynesian economics. See also | Keynesian economics | John Maynard Keynes | consumption | consumption line | marginal propensity to consume | marginal propensity to save | multiplier | Keynesian cross | aggregate expenditures |
