Capital stock (K) measuring the x-axis, y measured in the horizontal axis. y-axis of the gross national product. Accordingly, the output (Y), depreciation (D) and investment (I) curves are marked. As mobile and increase production curve of the capital stock, output will increase. Output growth at the rate of decline, which means that growth is no longer so steep. Investment (I) curve determines the level of output in the investment to upgrade existing workers or equipment. Depreciation (D) curve represents total depreciation expense of investment. Suppose the firm at a price of K0 business, the difference between investment and depreciation curve curve (bc) permit the increase in capital stock. Ideally, the price run-invested enterprises to K1, which is equal to the depreciation of investment, the highest output efficiency. This is a steady level of GDP.
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