Gross domestic product is related to national accounts, a subject in macroeconomics.
GDP was first developed by Simon Kuznets for a US Congress report in 1934, who immediately said not to use it as a measure for welfare (see below under limitations).
GDP can be determined in three ways, all of which should, in principle, give the same result. They are the product (or output) approach, the income approach, and the expenditure approach.
The most direct of the three is the product approach, which sums the outputs of every class of enterprise to arrive at the total. The expenditure approach works on the principle that all of the product must be bought by somebody, therefore the value of the total product must be equal to people's total expenditures in buying things. The income approach works on the principle that the incomes of the productive factors ("producers," colloquially) must be equal to the value of their product, and determines GDP by finding the sum of all producers' incomes.
Example: the expenditure method:
: GDP = private consumption + gross investment + government spending + (exports − imports), or
Note: "Gross" means that GDP measures production regardless of the various uses to which that production can be put. Production can be used for immediate consumption, for investment in new fixed assets or inventories, or for replacing depreciated fixed assets."Domestic" means that GDP measures production that takes place within the country's borders. In the expenditure-method equation given above, the exports-minus-imports term is necessary in order to null out expenditures on things not produced in the country (imports) and add in things produced but not sold in the country (exports).
Economists (since Keynes) have preferred to split the general consumption term into two parts; private consumption, and public sector (or government) spending. Two advantages of dividing total consumption this way in theoretical macroeconomics are:
Symbolically,
Gross Value Added = Value of output- Value of Intermediate Consumption.
Value of Output= Value of the total sales of goods and services + Value of changes in the inventories.
The sum of gross value added in various economic activities is known as GDP at factor cost.
GDP at factor cost plus indirect taxes less subsidies on products is GDP at Producer Price.
For measuring gross output of domestic product, economic activities (i.e. industries) are classified into various sectors. After classifying economic activities, the gross output of each sector is computer by any of the following two methods:
# By multiplying the output of each sector by their respective market price and adding them together and # By collecting data on gross sales and inventories from the records of companies and adding them together.
Subtracting each sector's intermediate consumption from gross output, we get sectoral gross value added (GVA)at factor cost. We, then add gross value of all sectors to get GDP at factor cost. Adding indirect tax less subsidies in GDP at factor cost, we get GDP at Producer prices.
This method measures GDP by adding incomes that firms pay households for the factors of production they hire- wages for labour, interest for capital, rent for land and profits for entrepreneurship.
The US "National Income and Expenditure Accounts" divide incomes into five categories: # Wages, salaries, and supplementary labour income # Corporate profits # Interest and miscellaneous investment income # Farmers’ income # Income from non-farm unincorporated businesses These five income components sum to net domestic income at factor cost.
Two adjustments must be made to get GDP: # Indirect taxes minus subsidies are added to get from factor cost to market prices. # Depreciation (or capital consumption) is added to get from net domestic product to gross domestic product.
Total income can be subdivided according to various schemes, leading to various formulae for GDP measured by the income approach. A common one is:
: GDP = compensation of employees + gross operating surplus + gross mixed income + taxes less subsidies on production and imports : GDP = COE + GOS + GMI + TP & M – SP & M
The sum of COE, GOS and GMI is called total factor income; it is the income of all of the factors of production in society. It measures the value of GDP at factor (basic) prices. The difference between basic prices and final prices (those used in the expenditure calculation) is the total taxes and subsidies that the government has levied or paid on that production. So adding taxes less subsidies on production and imports converts GDP at factor cost to GDP(I).
Total factor income is also sometimes expressed as: :Total factor income = Employee compensation + Corporate profits + Proprieter's income + Rental income + Net interest
Yet another formula for GDP by the income method is:
:
where R : rents I : interests P : profits SA : statistical adjustments (corporate income taxes, dividends, undistributed corporate profits) W : wagesNote the mnemonic, "ripsaw".
GDP (Y) is a sum of Consumption (C), Investment (I), Government Spending (G) and Net Exports (X – M). :Y = C + I + G + (X − M)
Here is a description of each GDP component:
A fully equivalent definition is that GDP (Y) is the sum of final consumption expenditure (FCE), gross capital formation (GCF), and net exports (X – M). :Y = FCE + GCF+ (X − M) FCE can then be further broken down by three sectors (households, governments and non-profit institutions serving households) and GCF by five sectors (non-financial corporations, financial corporations, households, governments and non-profit institutions serving households). The advantage of this second definition is that expenditure is systematically broken down, firstly, by type of final use (final consumption or capital formation) and, secondly, by sectors making the expenditure, whereas the first definition partly follows a mixed delimitation concept by type of final use and sector.
Note that C, G, and I are expenditures on final goods and services; expenditures on intermediate goods and services do not count. (Intermediate goods and services are those used by businesses to produce other goods and services within the accounting year. )
According to the U.S. Bureau of Economic Analysis, which is responsible for calculating the national accounts in the United States, "In general, the source data for the expenditures components are considered more reliable than those for the income components [see income method, below]."
If a hotel is a private home, spending for renovation would be measured as consumption, but if a government agency converts the hotel into an office for civil servants, the spending would be included in the public sector spending, or G.
If the renovation involves the purchase of a chandelier from abroad, that spending would be counted as C, G, or I (depending on whether a private individual, the government, or a business is doing the renovation), but then counted again as an import and subtracted from the GDP so that GDP counts only goods produced within the country.
If a domestic producer is paid to make the chandelier for a foreign hotel, the payment would not be counted as C, G, or I, but would be counted as an export.
A "production boundary" that delimits what will be counted as GDP.
"One of the fundamental questions that must be addressed in preparing the national economic accounts is how to define the production boundary–that is, what parts of the myriad human activities are to be included in or excluded from the measure of the economic production."All output for market is at least in theory included within the boundary. Market output is defined as that which is sold for "economically significant" prices; economically significant prices are "prices which have a significant influence on the amounts producers are willing to supply and purchasers wish to buy." An exception is that illegal goods and services are often excluded even if they are sold at economically significant prices (Australia and the United States exclude them).
This leaves non-market output. It is partly excluded and partly included. First, "natural processes without human involvement or direction" are excluded. Also, there must be a person or institution that owns or is entitled to compensation for the product. An example of what is included and excluded by these criteria is given by the United States' national accounts agency: "the growth of trees in an uncultivated forest is not included in production, but the harvesting of the trees from that forest is included."
Within the limits so far described, the boundary is further constricted by "functional considerations." The Australian Bureau for Statistics explains this: "The national accounts are primarily constructed to assist governments and others to make market-based macroeconomic policy decisions, including analysis of markets and factors affecting market performance, such as inflation and unemployment." Consequently, production that is, according to them, "relatively independent and isolated from markets," or "difficult to value in an economically meaningful way" [i.e., difficult to put a price on] is excluded. Thus excluded are services provided by people to members of their own families free of charge, such as child rearing, meal preparation, cleaning, transportation, entertainment of family members, emotional support, care of the elderly. Most other production for own (or one's family's) use is also excluded, with two notable exceptions which are given in the list later in this section.
Nonmarket outputs that are included within the boundary are listed below. Since, by definition, they do not have a market price, the compilers of GDP must impute a value to them, usually either the cost of the goods and services used to produce them, or the value of a similar item that is sold on the market. Goods and services provided by governments and non-profit organisations free of charge or for economically insignificant prices are included. The value of these goods and services is estimated as equal to their cost of production. This ignores the consumer surplus generated by an efficient and effective government supplied infrastructure. For example, government-provided clean water confers substantial benefits above its cost. Ironically, lack of such infrastructure which would result in higher water prices (and probably higher hospital and medication expenditures) would be reflected as a higher GDP. This may also cause a bias that mistakenly favors inefficient privatizations since some of the consumer surplus from privatized entities' sale of goods and services are indeed reflected in GDP.
GDP is product produced within a country's borders; GNP is product produced by enterprises owned by a country's citizens. The two would be the same if all of the productive enterprises in a country were owned by its own citizens, and those citizens did not own productive enterprises in any other countries. In practice, however, foreign ownership makes GDP and GNP non-identical. Production within a country's borders, but by an enterprise owned by somebody outside the country, counts as part of its GDP but not its GNP; on the other hand, production by an enterprise located outside the country, but owned by one of its citizens, counts as part of its GNP but not its GDP.
To take the United States as an example, the U.S.'s GNP is the value of output produced by American-owned firms, regardless of where the firms are located. Similarly, if a country becomes increasingly in debt, and spends large amounts of income servicing this debt this will be reflected in a decreased GNI but not a decreased GDP. Similarly, if a country sells off its resources to entities outside their country this will also be reflected over time in decreased GNI, but not decreased GDP. This would make the use of GDP more attractive for politicians in countries with increasing national debt and decreasing assets.
Gross national income (GNI) equals GDP plus income receipts from the rest of the world minus income payments to the rest of the world.
In 1991, the United States switched from using GNP to using GDP as its primary measure of production. The relationship between United States GDP and GNP is shown in table 1.7.5 of the National Income and Product Accounts.
SNA93 provides a set of rules and procedures for the measurement of national accounts. The standards are designed to be flexible, to allow for differences in local statistical needs and conditions.
The factor used to convert GDP from current to constant values in this way is called the GDP deflator. Unlike the Consumer price index, which measures inflation or deflation in the price of household consumer goods, the GDP deflator measures changes in the prices of all domestically produced goods and services in an economy–including investment goods and government services, as well as household consumption goods.
Constant-GDP figures allow us to calculate a GDP growth rate, which tells us how much a country's production has increased (or decreased, if the growth rate is negative) compared to the previous year. :Real GDP growth rate for year n = [(Real GDP in year n) − (Real GDP in year n − 1)] / (Real GDP in year n − 1)
Another thing that it may be desirable to compensate for is population growth. If a country's GDP doubled over some period but its population tripled, the increase in GDP may not be deemed such a great accomplishment: the average person in the country is producing less than they were before. Per-capita GDP is the measure compensated for population growth.
The ranking of countries may differ significantly based on which method is used.
There is a clear pattern of the purchasing power parity method decreasing the disparity in GDP between high and low income (GDP) countries, as compared to the current exchange rate method. This finding is called the Penn effect.
For more information, see Measures of national income and output.
The major disadvantage is that it is not a measure of standard of living. GDP is intended to be a measure of total national economic activity— a separate concept.
The argument for using GDP as a standard-of-living proxy is not that it is a good indicator of the absolute level of standard of living, but that living standards tend to move with per-capita GDP, so that changes in living standards are readily detected through changes in GDP.
Proponents of GDP as a metric of social well being argue that it is a value neutral measure and expresses what we can do, not what we should do. This is compatible with the fact that different people have different preferences and different opinions on what well-being is. Competing measures like GPI define well-being to mean things that the definers ideologically support. Therefore, they cannot function as the goals of a plural society. Moreover, they are more vulnerable to political manipulation.
Simon Kuznets in his very first report to the US Congress in 1934 said:
...the welfare of a nation can, therefore, scarcely be inferred from a measure of national income...In 1962, Kuznets stated:
Distinctions must be kept in mind between quantity and quality of growth, between costs and returns, and between the short and long run. Goals for more growth should specify more growth of what and for what.
United States Department of Commerce, Bureau of Economic Analysis, . Retrieved November 2009. In depth explanations of how GDP and other national accounts items are determined.
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