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In macroeconomics, investment "consists of the additions to the nation's capital stock of buildings, equipment, software, and inventories during a year" [1] or, alternatively, investment spending — "spending on productive physical capital such as machinery and construction of buildings, and on changes to inventories — as part of total spending" on goods and services per year.
The First Five-Year Plan stressed investment for capital accumulation in the spirit of the one-sector Harrod–Domar model. It argued that production required capital and that capital can be accumulated through investment: the faster one accumulates capital through investment, the higher the growth rate will be. The most fundamental criticisms ...
"Total capital formation" in national accounting equals net fixed capital investment, plus the increase in the value of inventories held, plus (net) lending to foreign countries, during an accounting period (a year or a quarter). Capital is said to be "formed" when savings are utilized for investment purposes, often investment in production.
In resource economics, Hartwick's rule defines the amount of investment in produced capital (buildings, roads, knowledge stocks, etc.) that is needed to exactly offset declining stocks of non-renewable resources. This investment is undertaken so that the standard of living does not fall as society moves into the indefinite future.
In this simple economic model with a closed economy there are three uses for GDP (the goods and services it produces in a year). If Y is national income (GDP), then the three uses of C consumption, I investment, and G government purchases can be expressed as:
In economics, net investment is spending which increases the availability of fixed capital goods or means of production and goods inventories.It is the total spending on newly produced physical capital (fixed investment) and on inventories (inventory investment)—that is, gross investment—minus replacement investment, which simply replaces depreciated capital goods.
Normally that ratio is about 20–23% of gross value-added. However, calling it the "business investment rate" or the "gross investment rate" is somewhat deceptive, since this indicator refers only to fixed investment, and more specifically, the net fixed investment (fixed assets bought, less disposals of fixed assets). The actual total funds ...
The reason for investment being inversely related to the Interest rate is simply because the interest rate is a measure of the opportunity cost of those resources. If the resources instead of financing the investment could be invested in financial assets, there is an opportunity cost of (1+r), where r is the interest rate.