1. 2015/2016 Introduction to Economics Augusto Ninni MACROECONOMIC AGGREGATES: EXERCISES 1

2. Ex. 10.1 – US’s GDP Question: Suppose to measure the GDP of US summing the value of all final goods and services in the economy. Determine the effects on GDP of the following transactions: a)A restaurant purchases fish for $100 from a fisher; b)A household spends $100 eating fish in a restaurant; c)Delta Airlines buys a new jet from Boeing for $200million; d)A Greek airline company buys a new jet from Boeing for $200million; e)Delta Airlines sells one of its jets to Denzel Washington for $100million; 2

3. Ex. 10.1 – US’s GDP Answer: a)A restaurant purchases fish for $100 from a fisher; Definition of GDP: The GDP is the market value of final goods and services produced within a country in a given period of time Therefore, the right answer is no change: this transaction is a purchase of an intermediate goods. 3

4. Ex. 10.1 – US’s GDP Answer: b)A household spend $100 eating fish in a restaurant; Composition of GDP from the point of view of demand: Z = C + I + G + X – M +$100 GDP: personal consumption expenditure 4

5. Ex. 10.1 – US’s GDP Answer: c) Delta Airlines buys a new jet from Boeing for $200million; Composition of GDP from the point of view of demand: Z = C + I + G + X – M +$200m GDP: Gross private domestic fixed investment 5

6. Ex. 10.1 – US’s GDP Answer: d) A Greek airline company buys a new jet from Boing for $200million; Composition of GDP from the point of view of demand: Z = C + I + G + X – M +$200m GDP: next export 6

7. Ex. 10.1 – US’s GDP Answer: d) Delta Airlines sells one of its jets to Denzel Washington for $100million; No change. The jet was already counted when it was produced, i.e., presumably when Delta (or some other airline companies) bought it new as an investment. 7

8. Ex. 10.2 – Mines and Jewels Consider an economy where: i)A company that extract argent pay workers €200,000 to extract 75 kg of argent. The argent is then sold to a jeweller for €300,000; ii)The jeweller pays her workers €250,000 to produce necklaces, which are then sold to final consumers for €1 million; 8

9. Ex. 10.2 – Mines and Jewels Questions: a) Using the approach based on the “value of final goods”, how much is the GDP of this economy; b) Which is the value added at each stage of production? Using the approach based on the added value, how much is the GDP of this economy? c) What is the value of of total wages and profits? Using the approach based on income, how much id the GDP of this economy? 9

10. Ex. 10.2 – Mines and Jewels Answer: a) GDP using the value of final goods; Using the approach base don the value of final goods, the GDP = €1 million, i.e., the value of the silver necklaces 10

11. Ex. 10.2 – Mines and Jewels Answer: b) Added valued and GDP; The economy is based on two sectors: Mines – A.V. = €300,000; Jewels – A.V. = 1,000,000 – 300,000 = €700,000 GDP = sum of A.V. of the two sectors = = 300,000 + 700,000 = €1,000,000 (same as before) 11

12. Ex. 10.2 – Mines and Jewels Answer: c) Wages, profits, and GDP; Wages: 200,000 + 250,000 = €450,000 (Mines) (Jewels) Profits: (300,000-200,000) + (1,000,000-250,000- 300,000)= (Mines) (Jewels) = 100,000+450,000= €550,000 GDP = sum of wages and profits in the two sectors= = 450,000 + 550,000 = €1,000,000 (same as before) 12

13. Ex. 10.3 – Cars, CPU and Oranges (I) An economy produces three goods: cars, computers and oranges. Quantity and unitary prices for the years 2006 – 2007 are the following: 13 20062007 QuantityPriceQuantityPrice Cars10€2,00012€3,000 Computers4€1,0006€500 Oranges1,000€11,000€1

14. Ex. 10.3 – Cars, CPU and Oranges (I) Questions: a) Which is the nominal GDP of the of the economy in 2006 and 2007? How much does it vary? b) Using the 2006 prices as a basis, which is the real GDP in 2006 and 2007? How much does it vary? c) Using the 2007 prices as a basis, which is the real GDP in 2006 and 2007? How much does it vary? d) Why doe the growth rates in b) and c) differ? Which is the most appropriate? Motivate your answer. 14

15. Ex. 10.3 – Cars, CPU and Oranges (I) Answer: a) Which is the nominal GDP of the of the economy in 2006 and 2007? How much does it vary? Definition: Nominal GDP t = price t x quantity t 2006 GDP: 10(2,000)+4(1,000)+1,000(1)=€25,000 2007 GDP: 12(3,000)+6(500)+1,000(1)=€40,000 % Δ = (40,000-25,000)/25,000 -> +60% nominal GDP 15

16. Ex. 10.3 – Cars, CPU and Oranges (I) Answer: b) Using the 2006 prices as a basis, which is the real GDP in 2006 and 2007? How much does it vary? 2006 real GDP: €25,000 2007 real GDP: 12(2,000)+6(1,000)+1,000(1)=€31,000 % Δ = +24% real (2006) GDP 16

17. Ex. 10.3 – Cars, CPU and Oranges (I) Answer: c) Using the 2007 prices as a basis, which is the real GDP in 2006 and 2007? How much does it vary? 2006 real GDP: 10(3,000)+4(500)+1,000(1)=€33,000 2007 real GDP: €40,000 % Δ = +21.2% real (2007) GDP 17

18. Ex. 10.3 – Cars, CPU and Oranges (I) Answer: d) Why doe the growth rates in b) and c) differ? Which is the most appropriate? Motivate your answer. The answers measure GDP in different units. Neither answer is incorrect: Laspeyres or Paasche indexes 18