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The Facts of Growth – The Long Run Blanchard: Macroeconomics Chapter 10: The Facts of Growth – The Long Run Slide #1 The Facts of Growth – The Long Run (Real GDP at Purchasing Power Parity) Annual Growth Rate Output per Capita (%) 1950-1973 Real Output per Capita (1992 dollars) 1973-1998 1950 1998 Ratio of Real Ouput Per Capita 1998/1950 France 4.2 1.6 5,150 19,158 3.7 Germany 4.9 1.8 4,356 20,059 4.6 Japan 8.1 2.5 1,820 19,907 10.9 United Kingdom 2.5 1.9 6,870 19,005 2.8 United States 2.2 1.5 11,170 25,890 2.3 Average 4.4 1.9 5,872 20,804 3.5 Blanchard: Macroeconomics Chapter 10: The Facts of Growth – The Long Run Slide #2 The Facts of Growth – The Long Run Observations • Strong growth 1950-1998 • Growth rates have decreased since the mid 1970s 1950-1978 4.4% (GDP/capita doubles every 16 years) 1973-1998 1.9% (GDP/capita doubles every 37 years) • Convergence in output/capita across countries??? Blanchard: Macroeconomics Chapter 10: The Facts of Growth – The Long Run Slide #3 The Facts of Growth – The Long Run Convergence in Output/Capita – The OECD Blanchard: Macroeconomics Chapter 10: The Facts of Growth – The Long Run Slide #4 The Facts of Growth – The Very Long Run Looking across two millennia • From the end of the Roman Empire to 1500, no output per capita growth in Europe • 1500-1700 -- Small growth in output per capita (0.1%/year and 0.2%/year 1700 to 1820) • 1820-1950 -- Modest growth (U.S. = 1.5%) • The high-growth of the 1950s and 1960s is unusual Leaders in output/capita change frequently: Italy Netherlands U.K. US Blanchard: Macroeconomics Chapter 10: The Facts of Growth – The Long Run Slide #5 The Facts of Growth – The Long Run Looking Across Lots of Countries – Convergence ??? Blanchard: Macroeconomics Chapter 10: The Facts of Growth – The Long Run Slide #6 The Facts of Growth – The Long Run Looking Across Countries – A Closer Look Blanchard: Macroeconomics Chapter 10: The Facts of Growth – The Long Run Slide #7 The Facts of Growth – The Long Run A Summary 1. Growth is not a historical necessity There’s been lots of stagnation and decline 2. Convergence of OECD countries to the U.S. may be the prelude to leapfrogging 3. The rapid post WWII growth was atypical Blanchard: Macroeconomics Chapter 10: The Facts of Growth – The Long Run Slide #8 The Facts of Growth – The Long Run Thinking About Growth: A Primer (The Solow Model) The Aggregate Production Function Y = F (K, N) Y = Aggregate Output K = Capital N = Labor F: Depends on technology Blanchard: Macroeconomics Chapter 10: The Facts of Growth – The Long Run Slide #9 The Facts of Growth – The Long Run Returns to Scale and Returns to Factors Constant returns to scale: 2Y = F(2K,2N) xY = F(xK,xN) Double all inputs Double output Decreasing returns to factors (capital & labor): • Increases in K and N lead to smaller and smaller increases in output • Diminishing Marginal Productivity of Labor (MPL) • Diminishing Marginal Productivity of Kapital (MPK) Blanchard: Macroeconomics Chapter 10: The Facts of Growth – The Long Run Slide #10 The Facts of Growth – The Long Run Output and Capital per worker: Y/N and K/N xY f ( xK , xN ) 1 x N Y K F ( ,1) n n Blanchard: Macroeconomics Chapter 10: The Facts of Growth – The Long Run Slide #11 The Facts of Growth – The Long Run Output and Capital per worker: Diminishing MPL Y/N = (K/N, 1) Output per worker, Y/N D´ C´ B´ A´ A B C D Capital per worker, K/N Blanchard: Macroeconomics Chapter 10: The Facts of Growth – The Long Run Slide #12 The Facts of Growth – The Long Run The Sources of Growth Output per worker, Y/N • An improvement in technology shifts the production function up F(K/N, 1) B´ F(K/N, 1) A´ A Capital per worker, K/N Blanchard: Macroeconomics Chapter 10: The Facts of Growth – The Long Run Slide #13