Investment, process of exchanging income during one period of time for an asset that is expected to produce earnings in future periods. Thus, consumption in the current period is foregone in order to obtain a greater return in the future.

For an economy as a whole to invest, total production must exceed total consumption. Throughout the history of capitalism, investment has been primarily the function of private business; during the 20th century, however, governments in planned economies and developing countries have become important investors.

From the standpoint of an individual, two types of investment may be distinguished: investment in the means of production and purely financial investment. Although at the individual level both types may provide a monetary return to the investor, from the standpoint of the entire economy, purely financial investments appear only as title transfers and do not constitute an addition to productive capacity.

Before the 1930s, investment was thought to be strongly affected by the going rate of interest, with the rate of investment likely to rise as the rate of interest fell. Since then, empirical investigation has shown business investment to be less responsive to interest rates and more dependent on businessmens expectations about future demand and profit, technical changes in production methods, and the expected relative costs of labour and capital.

Because investment increases an economys capacity to produce, it is the factor responsible for economic growth. For growth to occur smoothly, it is necessary that savers intend to save the same amount that investors wish to invest during a time period. If intended saving exceeds intended investment, unemployment may result; and if investment exceeds saving, inflation may occur. See also saving; marginal efficiency of investment.

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