The investment multiplier — a concept rooted in Keynesian economics — describes the phenomenon by which an initial injection of investment spending into an economy generates a total increase in national income and GDP that is a multiple of the original investment, as the initial spending creates income for recipients who then spend a portion of it, which in turn creates income for others, and so on through successive rounds of spending. The size of the multiplier depends on the Marginal Propensity to Consume (MPC) — the higher the MPC, the larger the multiplier effect. The formula is: Multiplier = 1 ÷ (1 − MPC) or equivalently 1 ÷ MPS (Marginal Propensity to Save). The investment multiplier has important implications for fiscal policy — governments use it to justify infrastructure spending and stimulus measures. For macroeconomic analysts and investors on Ventura Securities evaluating the impact of India's capital expenditure budgets, infrastructure project announcements, and fiscal stimulus packages on GDP growth, corporate earnings, and equity market direction, the investment multiplier framework provides a useful analytical lens for assessing second-order economic effects.
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