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Ineconomics,output is the quantity and quality ofgoods orservicesproduced in a given time period, within a given economic network,^[1] whether consumed or used for further production.^[2] The economic network may be afirm, industry, or nation. The concept ofnational output is essential in the field ofmacroeconomics. It is national output that makes a country rich, not large amounts ofmoney.^[3]

Output is the result of an economic process that has usedinputs to produce a product or service that is available for sale or use somewhere else.

Net output, sometimes callednetput is a quantity, in the context of production, that is positive if the quantity is output by the production process and negative if it is an input to the production process.^{[clarification needed]}

The profit-maximizing output condition for producers equates the relative marginal cost of any two goods to the relative selling price of those goods; i.e.

${\displaystyle \frac{M{C}_1}{M{C}_2}=\frac{P_1}{P_2}}$

One may also deduce the ratio of marginal costs as the slope of theproduction–possibility frontier, which would give the rate at which society can transform one good into another.

When a particular quantity of output is produced, an identical quantity of income is generated because the output belongs to someone. This is theidentity that output equals income (where an identity is an equation that is always true regardless of the values of any variables).

Output can be sub-divided into components based on whose demand has generated it – totalconsumptionC by members of the public (including on imported goods) minus imported goodsM (the difference being consumption of domestic output),spendingG by the government, domestically produced goodsXbought by foreigners, planned inventory accumulationI_{planned inven}, unplanned inventory accumulationI_{unplanned inven} resulting from incorrect predictions of consumer and government demand, andfixed investmentI_f on machinery and the like.

Likewise, income can be sub-divided according to the uses to which it is put – consumption spending,taxesT paid, and the portion of income neither taxed nor spent (savingS).

Since output identically equals income, the above leads to the following identity:

${\displaystyle C+I_{\text{planned inven}}+I_{\text{unplanned inven}}+I_f+G+X-M\equiv C+S+T,}$

where the triple-bar sign denotes an identity. This identity is distinct from the goods marketequilibrium condition, which is satisfied when unplanned inventory investment equals zero:

${\displaystyle C+I_{\text{planned inven}}+I_f+G+X-M=C+S+T.}$

Output is the result of an economic process that has used inputs to produce a product or service that is available for sale or use somewhere else.

Net output, sometimes called netput, is a quantity, in the context of production, that is positive if the quantity is output by the production process and negative if it is an input to the production process.^{[clarification needed]}

In macroeconomics, the question of why national output fluctuates is a very critical one. And though no consensus has developed, there are some factors which economists agree make output go up and down.If we take growth into consideration, then most economists agree that there are three basic sources for economic growth: an increase in labour usage, an increase in capital usage and an increase ineffectiveness of the factors of production.Just as increases in usage or effectiveness of factors of production can cause output to go up, anything that causes labour, capital or their effectiveness to go down will cause a decline in output or at least a decline in its rate of growth.

Exchange of output between two countries is a very common occurrence, as there is always trade taking place between different nations of the world. For example, Japan may trade its electronics with Germany for German-made cars. If the value of the trades being made by both the countries is equal at that point of time, then their trade accounts would be balanced: the exports would be exactly equal to imports in both the countries.^[4]

• Macroeconomic aggregates

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