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The Incremental Capital-Output Ratio (ICOR) is the ratio of investment to growth which is equal to the reciprocal of the marginal product of capital. The higher the ICOR, the lower the productivity of capital or the marginal efficiency of capital. The ICOR can be thought of as a measure of the inefficiency with which capital is used. In most ...
Likewise, the marginal product of capital refers to the additional production of output that results from using an additional unit of physical capital (machinery, etc.). If very small increments are being considered, so that calculus is used, then this ratio of incremental amounts is a derivative (for example, the marginal propensity to consume ...
Otherwise, if the cost of capital is higher, the firm will be losing profit when adding extra units of physical capital. [3] This concept equals the reciprocal of the incremental capital-output ratio. Mathematically, it is the partial derivative of the production function with respect to capital.
In this model, increases in output, i.e. economic growth, can only occur because of an increase in the capital stock, a larger population, or technological advancements that lead to higher productivity (total factor productivity). An increase in the savings rate leads to a temporary increase as the economy creates more capital, which adds to ...
Average physical product (APP), marginal physical product (MPP) In economics and in particular neoclassical economics, the marginal product or marginal physical productivity of an input (factor of production) is the change in output resulting from employing one more unit of a particular input (for instance, the change in output when a firm's labor is increased from five to six units), assuming ...
In summation, the savings rate times the marginal product of capital minus the depreciation rate equals the output growth rate. Increasing the savings rate, increasing the marginal product of capital, or decreasing the depreciation rate will increase the growth rate of output; these are the means to achieve growth in the Harrod–Domar model.
This implies that if k (the capital-output ratio) is constant, an increase in Y requires an increase in K. That is, net investment, I n equals: I n = k×ΔY. Suppose that k = 2 (usually, k is assumed to be in (0,1)). This equation implies that if Y rises by 10, then net investment will equal 10×2 = 20, as suggested by the accelerator effect.
Output per worker grows at a roughly constant rate that does not diminish over time. Capital per worker grows over time. The capital/output ratio is roughly constant. (1+2) The rate of return on capital is constant. The share of capital and labor in net income is nearly constant. The wage grows over time. (2+4+5)