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Eduncle Best Answer
Neo-classical growth model does not assume heterogeneity of capital. At the core of the growth model, there is a neo-classical production function. The neo-classical production function is characterized with diminishing marginal productivity of inputs. In absence of technological progress, it is the diminishing marginal product of capital that chokes off the long-run growth through capital accumulation and the economy moves into the steady state equilibrium in the neo-classical growth model. The production function is one of variable coefficients implying innumerable proportions in which capital and labour can be substituted for each other. Since the starting equation of the neo-classical growth theory is investment equals saving, the theory also assumes the flexibility of the interest rate that adjusts freely to bring saving and investment into balance. Perfect competition prevails in goods and factors market so that competition in the respective market produces a single price for the factors involved, namely a single wage rate, a single rate of interest, commodity price and profit. Wages and prices are assumed to move freely to clear each market.