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Net ecosystem production (NEP) in ecology, limnology, and oceanography, is the difference between gross primary production (GPP) and net ecosystem respiration. [1] Net ecosystem production represents all the carbon produced by plants in water through photosynthesis that does not get respired by animals , other heterotrophs , or the plants ...
A variety of measures of national income and output are used in economics to estimate total economic activity in a country or region, including gross domestic product (GDP), Gross national income (GNI), net national income (NNI), and adjusted national income (NNI adjusted for natural resource depletion – also called as NNI at factor cost).
An extremely important definition of income is Haig–Simons income, which defines income as Consumption + Change in net worth and is widely used in economics. [ 2 ] For households and individuals in the United States , income is defined by tax law as a sum that includes any wage , salary , profit , interest payment, rent , or other form of ...
In business and accounting, net income (also total comprehensive income, net earnings, net profit, bottom line, sales profit, or credit sales) is an entity's income minus cost of goods sold, expenses, depreciation and amortization, interest, and taxes, and other expenses for an accounting period. [1] [better source needed]
Aggregate income [1] [2] [3] is the total of all incomes in an economy without adjustments for inflation, taxation, or types of double counting. [4] Aggregate income is a form of GDP that is equal to Consumption expenditure plus net profits. 'Aggregate income' in economics is a broad conceptual term.
National income (NI) is the sum of employees, proprietors, rental, corporate, interest, and government income less the subsidies government pays to any of those groups. Net national product (NNP) is National Income plus or minus the statistical discrepancy that accumulates when aggregating data from millions of individual reports.
The net energy gain from the production of coal, oil and gas has declined over time as the easiest to produce sources have been most heavily depleted. [62] In traditional energy economics, surplus energy is often seen as something to be capitalized on—either by storing for future use or by converting it into economic growth.
The energy converted through photosynthesis is carried through the trophic levels of an ecosystem as organisms consume members of lower trophic levels. Primary production can be broken down into gross and net primary production. Gross primary production is a measure of the energy that a photoautotroph harvests from the sun.