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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 ...
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.
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 ...
If capital's share in output is 1 ⁄ 3, then labor's share is 2 ⁄ 3 (assuming these are the only two factors of production). This means that the portion of growth in output which is due to changes in factors is .06×(1 ⁄ 3)+.01×(2 ⁄ 3)=.027 or 2.7%. This means that there is still 0.3% of the growth in output that cannot be accounted for.
Let Y represent output, which equals income, and let K equal the capital stock. S is total saving, s is the savings rate, and I is investment. δ stands for the rate of depreciation of the capital stock. The Harrod–Domar model makes the following a priori assumptions:
The capital/output ratio is roughly constant over long periods of time; The rate of return on investment is roughly constant over long periods of time; There are appreciable variations (2 to 5 percent) in the rate of growth of labor productivity and of total output among countries.
where + is the cost to the firm, r the rental rate of capital, w the wage rate for labor, and P is the price of the output. As in microeconomics supply and demand models, first-order conditions that the derivative of this function with respect to capital and labor will be zero at the functions maximum.
Where the capital-output ratio will depend upon the relationship of the growth of capital and the growth of productivity. Wages and profits constitute the income , where wages comprise salaries and earnings of manual labor, and profits comprise incomes of entrepreneurs as well as property owners.