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A positive flow of intended inventory investment occurs when a firm expects that sales will be high enough that the current level of inventories on hand may be insufficient—perhaps because in the presence of very short-term fluctuations in the timing of customer purchases, there is a risk of temporarily being unable to supply the product when a customer demands it.
For example, the IS model of only the goods market [1]: pp. 250–260 derives the market-clearing (and thus endogenous) level of output depending on the exogenously imposed level of interest rates, since interest rates affect the physical investment component of the demand for goods.
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 concept of inventory, stock or work in process (or work in progress) has been extended from manufacturing systems to service businesses [1] [2] [3] and projects, [4] by generalizing the definition to be "all work within the process of production—all work that is or has occurred prior to the completion of production". In the context of a ...
Economics, business, accounting, and related fields often distinguish between quantities that are stocks and those that are flows. These differ in their units of measurement . A stock is measured at one specific time, and represents a quantity existing at that point in time (say, December 31, 2004), which may have accumulated in the past.
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.
Notably this is the case in Olivier Blanchard's widely-used [13] intermediate-level textbook "Macroeconomics" since its 7th edition in 2017. [ 14 ] In this case, the LM curve becomes horizontal at the interest rate level chosen by the central bank, allowing a simpler kind of dynamics.
In the simplest exposition of Keynesian theory, the economy is assumed to be closed (which implies that NX = 0), and planned investment is exogenous and determined by the animal spirits of investors. Consumption is an affine function of income, C = a + bY where the slope coefficient b is called the marginal propensity to consume .