Productivity and Economic Growth

Principles of Macroeconomics: Chapter 9 - Productivity and Economic Growth

Introduction

  • Historical Context:

    • For most of human history, economic growth was not prevalent; output per unit of input remained constant over time.
    • The situation changed in the 18th century with the onset of the Industrial Revolution, during which productivity growth began.
    • The increase in productivity significantly improved the economic well-being of people globally.

  • Chapter Overview:

    • Investigate the causes of productivity growth, placing a special emphasis on technology.
    • Explore methods to measure the impact of technology on economic growth.
    • Discuss policy proposals aimed at enhancing technology adoption.
    • Examine the measures that governments and societies can implement to foster economic growth.

Key Concepts

  • Productivity:
    • Defined as the output per hour of work.
  • Productivity Growth:
    • Represented as the percentage increase in productivity from one year to the next.

Historical Productivity Growth

  • Graphical Representation (Figure 9.1):
    • Displayed productivity growth patterns over the past 300 years:
    • Pre-1800: Minimal growth.
    • 1800-1820: Initial increases associated with the Industrial Revolution.
    • 1820-1870: Growth during the early industrial age.
    • 1870-1913: Continued industrial expansion.
    • 1913-1973: Period of significant growth.
    • 1973-1998: Productivity slowdown.
    • 1998-2008: Growth transition with the advent of internet technology.
    • 2008-2019: Continued effects of the mobile technology revolution.

Labor and Capital without Technology

  • Production Function with Labor:

    • Expressed as:
      Y=F(L)Y = F(L)
    • Where:
    • YY = Real GDP
    • LL = Labor input

  • Understanding Labor Impact:

    • Initial changes in labor lead to minor output changes represented by the flatter portion of the production function.
    • The impact of labor increases significantly but shows diminishing returns as more labor is applied.

Diminishing Returns to Labor

  • Concept Overview:
    • As more labor is utilized, the additional output gained from each successive unit of labor eventually diminishes.
    • Diminishing Returns (to Labor):
    • Defined as the scenario where successive increases in labor, while holding other inputs constant, lead to decreasing additional production.

Adding Capital to the Production Function

  • Definitions:

    • Capital (Physical Capital):
    • Includes machines, factories, and all physical assets used for goods production.
    • Depreciation:
    • The process by which physical capital wears out over time.
    • Net Investment:
    • The total investment minus depreciation.

  • Updated Production Function:

    • Now represented as:
      Y=F(K,L)Y = F(K, L)
    • Where:
    • KK = Capital input
    • LL = Labor input
    • An increase in capital shifts the production function upwards, allowing for more output.

Diminishing Returns to Capital

  • Concept Overview:
    • As capital is increased, the output also increases; however, each additional unit of capital results in diminishing output improvements.

Role of Technology

  • Defining Technology:

    • Technology refers to any factor that increases the output attainable with a given set of labor and capital inputs.
    • Updated Production Function with Technology:
      Y=F(L,K,T)Y = F(L, K, T)
    • Where:
    • TT = Technology

  • Technological Change:

    • Concept refers to improvements in technology over time, also known as technological progress.
    • Invention:
    • Discovery of new knowledge.
    • Innovation:
    • Practical application of new knowledge that results in new or significantly altered products.
    • Diffusion:
    • Process through which innovations spread across the economy.
    • Labor-Saving Technological Change:
    • Where fewer workers are required to produce the same amount of output (e.g., steam-powered tractors replacing horse-drawn plows).
    • Capital-Saving Technological Change:
    • Where fewer machines are used to complete the same output (e.g., implementing a night shift in production).

Learning and Human Capital

  • Learning by Doing:
    • Defined as improvement in proficiency as workers practice a specific task repeatedly (e.g., production of Boeing 777 airplanes results in skilled workers).
    • Human Capital:
    • Refers to the accumulated knowledge and skills of individuals (e.g., a college education is an investment in future capabilities).
    • The investment in human capital reflects the investment decision reliant on comparing expected benefits versus costs.

Technology and Patents

  • Patent:
    • Recognition of an invention's originality, granting the inventor exclusive usage rights until patent expiration.
    • The number of patents serves as an indicator of technological progress.

Characteristics of Technology

  • Nonrivalry:
    • One person's usage of technology does not diminish its availability to another.
    • Example: The enjoyment of a new television technology remains unaffected regardless of others using it.
  • Nonexcludability:
    • Inventors cannot exclude others from using their created technology.
  • Spill-Over Effect:
    • The process whereby the creation of one technology paves the way for subsequent innovations.

Measuring Technology

  • Growth Accounting Formula:
    • An equation to determine productivity growth:
      extGrowthrateofproductivity=extCapital′sshareofincomeimesextGrowthrateofcapitalperhourofwork+extGrowthrateoftechnologyext{Growth rate of productivity} = ext{Capital's share of income} imes ext{Growth rate of capital per hour of work} + ext{Growth rate of technology}
  • Example Calculation:
    • Given:
    • Growth rate of real GDP per hour of work: 2%
    • Growth rate of capital per hour of work: 3%
    • Therefore, growth rate of technology can be calculated as:
      ext{Growth rate of technology} = ext{Growth rate of productivity} - rac{1}{3} imes ext{Growth rate of capital per hour of work}
  • When calculated, this yields a growth rate of technology of 0.01 or 1%.

Video Insights

  • Growth Accounting Video:
    • Introduces the concept of growth accounting which breaks down productivity growth based on production factors versus technological advancements.

Technology Policy

  • Policy Recommendations:
    • Encourage investments in human capital through:
    • Higher educational standards
    • Incentives for quality teaching
    • Increased education funding
    • Foster R&D through:
    • Increased funding
    • Tax credits for research activities
    • Greater investments in new capital technologies.

Government Intervention in Technology

  • Appropriateness of Government Intervention:
    • Two questions to evaluate:
    1. Is the private sector providing adequate incentives for technology?
    2. Can government intervention achieve better results without a substantial risk of failure?
    • If the answer to the first question is "no" and the second is "yes", government intervention may be warranted.

Summary

  • The rate of productivity growth, reflecting the percentage increase in output per hour of work, significantly influences long-term economic well-being.
  • Technology, alongside labor and capital, is fundamental in determining economic growth.
  • Technological advancements have played a crucial role in productivity growth since the late 1700s, contributing to wealth in industrial countries.
  • The economic definition of technology extends beyond high-tech products to encompass broader innovations.
  • Technology policy aims to mitigate disincentives affecting investment and innovation in the private sector.