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Bases of Economics

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Submitted By martinafuci
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Economics

GDP: it’s the market value of the final goods and services newly produced in a fixed period of time within the geographic boundaries of a country.
Fundamental Identity: GDP=total production=total expenditure=total income (wages+profits)
Expenditure Approach (supply=demand): Y= C+I+G+NX (G= government purchase, that is different from public expenses, because government spending includes also transfers).
What happens if price rise over time? Also if the quantity of the output does not increase the GDP seems to increase (price x quantity). To overcome this problem we need to distinguish between real GDP and nominal GDP. Economists calculate real output by using for every year the same constant price as weights.
GDP (y1) = Q(1) x P(0) we are using year 0 as base year, and we use this year also for the next years.
However in this way we don’t take into account the added value of technologies, in fact, as the computer industry, pc have raising price because they became better in the years. For this reason government to calculate GDP started to use “chain weight”. It means calculate the growth for example between the year 3 and 4, by using Y3 prices and by using Y4 prices and taking a geometric average.
Different indexes: 1. Laspeyres Index: initial period prices 2. Paasche Index: final period prices 3. Fisher Index: Geometric average (GDP uses a chained Fisher Index)
Fisher index is useful because it deals with substitution bias and it eliminates the need to rebase GDP.
GDP try to measure economic activity, but it does not take into account: Underground economic activities (such as illegal and tax avoidance), not market transaction, statistical revisions and negative consequences of production.
GDP does not measure welfare, in fact, it does not take into account health, quality of life factors, useless of government spending,

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