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Business Cycles and the Dynamics of GDP

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  1. Business Cycles and the Dynamics of GDP Chap. 27

  2. Global Financial Crisis • Why did output fall globally, why so much, and why has it lasted so long? Statistics OECD

  3. HK Contraction and Recovery Hong Kong Census & Statistics

  4. Hong Kong Census & Statistics

  5. Two Impressions • GDP Volume is growing over time. • Growth is variable. Sometimes fast, sometimes flat, sometimes negative. • Decompose the series into two parts which capture each of these phenomena. • Potential GDP • Output Gap

  6. GDP is output per worker times number of workers. Labor Productivity GDP and Productivity

  7. Unemployment Rates • The population resides in 1 of 3 categories • Not in the Labor Force: Not working and not actively seeking work • Labor Force • Employed: Currently working. • Unemployed: Not working but seeking work. Unemployment Rate

  8. Natural Rate of Unemployment • Always people losing or leaving jobs and looking for new ones. Always people joining the labor force. • In natural state of labor market, people looking for jobs will match the number of people who find jobs. • uN = Natural Rate: Rate at which there is neither excess demand nor supply in labor market. (mostly stable).

  9. Potential Employment and Output • Potential employment is the level of employment when unemployment equals the natural rate. • Potential output is GDP when employment equals potential employment

  10. Hong Kong Census & Statistics HK GDP vs. Estimate of HK Potential GDP

  11. Recessions and Expansions • The path of the economy is often divided into periods called recessions and periods caused expansions. • No precise definition of “recession” or “expansion” exists, sometimes as consecutive quarters of growth. • Business cycles are defined by the Output Gap, • Sometimes the period from peak of the output gap to the trough is a recession and the period when the output gap is increasing is an expansion. US Business Cycle Dates

  12. RecessionExpansion

  13. Output and Unemployment

  14. Business Cycles Focus on explaining fluctuations in real GDP, Y, and the GDP Deflator, P. Framework reminiscent of the supply and demand model.

  15. SUPPLY

  16. Two Aspects of Potential Output • Potential Output is unrelated to the price level but is determined by capital infrastructure, efficiency of labor markets, population, technological know-how. • Output increases above potential only if unemployment falls below natural level; • if unemployment rises above natural level, output will be below potential.

  17. Potential output and labor market. • Potential output can be viewed as a level consistent with equilibrium in labor market. • Wages hit a level so workers want to work as many hours as firms want to hire. • When output is above potential output, low unemployment and the search for workers will push up wages. • When output is below potential, high unemployment and the surplus of workers will push down wages.

  18. Potential Output YP P Unemployment above natural rate Unemployment below natural rate Upward Pressure on Wages Downward Pressure on Wages Y

  19. Why does SRAS Slope Up?Take wages as given in Short Run • Money wages paid to workers adjust dynamically over time through negotiation. • At a given wage, a rise in the price level reduces the cost of labor relative to value of goods produced making hiring labor to produce goods more attractive. • At a given wage rate, higher prices induce higher production → in the short run, supply is positively associated with output.

  20. Short Run Aggregate Supply Curve YP SRAS P Y

  21. 1. Shift in Potential Output • Advance in Technology Frontier, PP& E, or expansion in potential labor force (population, demographics). • Shifts SRAS w/ potential output. 2. Shifts in SRAS • When dollar cost of labor (or prices of energy) shift, changes in costs are passed on into prices. • Wages and other cost shifters shift SRAS at a given level potential output.

  22. 1. Expansion in Output Potential SRAS' YP ' YP SRAS P Y Normal for technological progress to increase potential output.

  23. 2. Increase in Wages SRAS' P YP SRAS Y

  24. DEMAND

  25. Two Views • Monetarist View • Demand can be described by liquidity/money • Keynesian View • Demand best Viewed as Elements of Expenditure

  26. Simplest monetary theory is the Quantity Theory of Money. • Purchasing power of money is equal to the quantity of money (Mt) times the speed of circulation (V, # of transactions) • Purchasing power means # of goods (Yt)multiplied by price per good (Pt) Pt * Yt= Moneyt* Velocity Quantity Theory

  27. Aggregate Demand Curve P Holding money & velocity constant AD Y

  28. MONEY SUPPLYTHE STOCK OF THE MEDIUM OF EXCHANGE.

  29. Japan’s Money Supply

  30. Monetary Aggregates in HK HKMA Monthly Statistical Bulletin

  31. Aggregate Demand Curve P Wealth Effect, Competitiveness Effect AD Y

  32. Expenditure: C + I + G + NX Prices and Spending • Wealth Effect – Real value of liquid/monetary assets rises as prices fall. This adds to wealth of households stimulating consumption. • Competitiveness Effect – Holding exchange rate constant, a lower price level makes domestic exports more attractive and foreign imports less stimulating net exports. For now, hold interest rate and exchange rate constant.

  33. AS-AD Model

  34. Equilibrium • Equilibrium in the competitive market occurs when the price is set at a level (P*) such that the amount that consumers want to buy is equal to the amount that sellers want to sell (Y*). Excess SupplyIf P were above equilibrium, sellers would want to sell more goods than buyers would want to buy. Competition between sellers would force prices down. Excess DemandIf P were below equilibrium, customers would want to buy more goods than people would want to sell. Competition between buyers would force prices up.

  35. Equilibrium GDP and Price Level P SRAS P* AD Y Y*

  36. Output below potential: Recessionary Gap. P YP SRAS 1 P* AD GAP Y Y*

  37. Output above potential: Inflationary Gap. YP SRAS P 2 P* AD GAP Y Y*

  38. Self Correction Process • Business cycles have a natural end. • In short run, Y* may be greater than or less than potential output. However, in that case surplus or shortage of workers in labor markets will be putting downward or upward pressure on wages. • Pressure on wage costs will shift the supply curve until equilibrium output is equal to potential output.

  39. AS1 YP P AS AS2 1 W↓ W↑ 2 AD Y Movement to Long Term Equilibrium

  40. Cyclical Fluctuations • Period-by-period, different important events will impact the economy. We will think of these events as primarily driving the demand side of the economy (shifting the AD curve) or primarily driving the supply side (shifting the supply side). • The strength of these will determine the correspondence between movements in output and inflation.

  41. Demand side shocks cause output and prices to move together. P SRAS P* 1 P** 2 AD1 AD2 Y Y** Y*

  42. Output below potential. Downward pressure on wages. Cost of production falls and AS shifts down YP SRAS P SRAS2 1 2 As costs fall, competitive prices fall, there is a movement along the AD curve. 3 P*** Wages fall AD2 Y Y***

  43. Wages will keep falling until the surplus of labor is absorbed – when prices fall enough that demand reaches potential output P SRAS2 SRAS3 3 Wages fall 4 AD2 Y YP

  44. What shifts the AD curve?

  45. AS-AD and Expected inflation • Potential GDP generally increases at a consistent rate. • On average, aggregate quantity of liquid assets tends to increase faster than potential GDP. • Workers wages will tend to rise to match increases in the cost of living. • AD does not always rise evenly with GDP.

  46. Rule of Thumb The growth rate of product is approximately equal to the sum of the growth rates of the elements of a product. Rule of Thumb

  47. Assuming stable velocity Inflation occurs when money growth speeds ahead of output growth. The unbounded creation of fiat money leads to inflation which ultimately will make the money worthless. Money and Inflation

  48. Money & Inflation: 1975-1994

  49. Dynamic AS-AD Model: Ideal YPt+1 YtP SRASt+1 P SRASt Demand expansion matches supply expansion P*t+1 Average Inflation Pt* ADt+1 ADt Y Yt* Y*t+1 Ch. 29, 711-712