According to the Keynesian income determination model, as the level of expenditures is instantaneously increased through government or private investment a portion of that amount (b), the marginal propensity to consume, is immediately respent. This precipitates a perpetual turnover of each fractional amount throughout time such that the level of expenditures eventually amounts to (1/1‐b) times the initial increase in investment. The total impact on the level of income resulting from an increase in investment or government expenditures is called the multiplier. As derived in the macro‐economic models no leakages from the system to reduce the total impact are assumed, so that in reality the multiplier is considered to fall short of (1/1‐b).
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