Harrod-Domar Model | Exogenous Growth model | Surplus Labor Model | Harris-Todaro Model

EXOGENOUS GROWTH MODEL (NEO-CLASSICAL MODEL) The Exogenous growth model was an extension to the Harrod-Domar model which included the new term, "productivity growth". The most important contributor to this model, Robert Solow; in 1956 developed a relatively simple growth model which fit available data on US economic growth with some success. Solow received the 1987 Nobel Prize in Economics for his work on this model. Solow extended the Harrod-Domar model by: * Adding labour as a production factor; * Requiring diminishing returns to labour and capital separately, and constant returns to scale for both factors combined; * Introducing a time-varying technology variable distinct from capital and labor. The capital-output and capital-labor ratios are not fixed as they are in the Harrod-Domar model. These refinements allowed increasing capital intensity to be distinguished from technological progress. Short Run Implications of the Model * Policy measures like tax cuts or investment subsidies can affect the steady state level of output but not the long-run growth rate. * Growth is affected only in the short-run as the economy converges to the new steady state output level. * The rate of growth as the economy converges to the steady state is determined by the rate of capital accumulation. * Capital accumulation is in turn determined by the savings rate and the rate of capital depreciation. Long Run Implications of the Model In neo-classical growth model, the long-run rate of growth is Exogenously determined, i.e. it is determined outside of the model. A common prediction of these model is that an economy is always converged towards a steady state rate of growth, which depends only on the rate of technological progress and the rate ofl growth of labor force. A country with a higher saving rate will experience faster growth, e.g. Singapore had a 40% saving rate in the period 1960 to 1996 and annual GDP growth of 5-6%, compared with Kenya in the same time period which had a 15% saving rate and annual GDP growth of just 1%. This relationship was anticipated in the earlier models, and is retained in the Solow model; however, in the very long-run capital accumulation appears to be less significant than technological innovation in the Solow model. Assumptions of the Model The key assumption of the this model is that capital is subjected to diminishing returns. Given a fixed stock of labor, the impact on output of the last unit of capital accumulated will always be less than the one before. Assuming for simplicity no technological progress or labor force growth, diminishing returns implies that at some point the amount of new capital produced is only just enough to make up for the amount of existing capital lost due to depreciation. At this point, because of the assumptions of no technological progress or labor force growth, the economy ceases to grow. Assuming non-zero rates of labour growth complicates matters somewhat, but the basic logic still applies- in the short-run the rate of growth slows as diminishing returns take effect and the economy converges to a constant "steady-state" rate of growth. Including non-zero technological progress is very similar to the assumption of non-zero workforce growth, in terms of "effective labour": a new steady state is reached with constant output per worker-hour required for a unit of output. However, in this case, per-capita output is growing at the rate of technological progress in the "steady-state". Criticisms of the Model Limitations of the model include its failure to take account of entrepreneurship (which may be catalyst behind economic growth) and strength of institutions (which facilitate economic growth). In addition, it does not explain how or why technological progress occurs. This failing has led to the development of endogenous growth theory, which endogenizes technological progress and/or knowledge accumulation. From the far left, Marxist critics of growth theory itself have questioned the model's underlying assertion that economic growth is necessarily a good thing. While the model is welfare maximizing, the use of a representative agent hides equity issues. combat population growth and depreciation. Therefore output per worker falls from y2 to y0. emploi juriste Vous cherchez des offres Directeur Financier ? Retrouvez des milliers d'offres Directeur Financier de haut niveau sur Experteer. sunparks voucher codes | Stock Buy | Insolventierecht Eindhoven | Lening simulatie Lanyards Digital ID complete range of stock lanyards, a very popular choice for finding just the right lanyards for your event. Strong and durable, beaded lanyards come in both plastic and metal. 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