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econ quiz 4 study guide notes, Study notes of Economics

Pennsylvania State University - BeaverEconomics

econ quiz 4 study guide notes.

Typology: Study notes

2025/2026

Uploaded on 04/21/2026

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ECON 104 — Quiz 4 Study Guide
Markets, Long-Run Growth, PWPF & Economic Systems
1. Key Concepts & Definitions
Markets
• A place where firms and consumers buy and sell goods/services at an agreed-upon price
• Prices convey information and incentivize behavior
• Markets allocate resources during periods of changing prices
• Economic decision-making is decentralized/individualized
Economic Systems
• Command Economy: Government regulates all businesses, directly affects actions and prices
• Pure Market Economy: Ideally, no government interference with markets
• Mixed Economy: Most markets operate freely, but some government interference exists (how
most countries are organized)
Functions of Prices
• Give signals and incentives (NOT: quantity info, per-worker production, or included in PWPF)
• Inform buyers and sellers about scarcity and value
• Guide resource allocation without central planning
Creative Destruction
• Markets continually improve goods and services
• A new business/industry replaces an older one due to higher profits or improved products
• Example: RedBox/Blockbuster replaced by streaming services (Netflix)
• Example: American Eagle replaced by Shein
• This is a BENEFIT of markets
Zero Sum vs. Economic Growth
• Zero Sum: One party gains at the EXPENSE of another (everyone else loses)
• Economic growth is NOT zero sum — everyone can gain simultaneously
Natural Resources & Growth
• Historically, an abundance of natural resources does NOT really affect economic growth
• Technology and capital are far more important drivers
Human Health & Economic Growth
• TRUE: Human health increases as economic growth occurs
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ECON 104 — Quiz 4 Study Guide

Markets, Long-Run Growth, PWPF & Economic Systems

1. Key Concepts & Definitions

Markets

  • A place where firms and consumers buy and sell goods/services at an agreed-upon price
  • Prices convey information and incentivize behavior
  • Markets allocate resources during periods of changing prices
  • Economic decision-making is decentralized/individualized

Economic Systems

  • Command Economy: Government regulates all businesses, directly affects actions and prices
  • Pure Market Economy: Ideally, no government interference with markets
  • Mixed Economy: Most markets operate freely, but some government interference exists (how most countries are organized)

Functions of Prices

  • Give signals and incentives (NOT: quantity info, per-worker production, or included in PWPF)
  • Inform buyers and sellers about scarcity and value
  • Guide resource allocation without central planning

Creative Destruction

  • Markets continually improve goods and services
  • A new business/industry replaces an older one due to higher profits or improved products
  • Example: RedBox/Blockbuster replaced by streaming services (Netflix)
  • Example: American Eagle replaced by Shein
  • This is a BENEFIT of markets

Zero Sum vs. Economic Growth

  • Zero Sum: One party gains at the EXPENSE of another (everyone else loses)
  • Economic growth is NOT zero sum — everyone can gain simultaneously

Natural Resources & Growth

  • Historically, an abundance of natural resources does NOT really affect economic growth
  • Technology and capital are far more important drivers

Human Health & Economic Growth

  • TRUE: Human health increases as economic growth occurs

World Poverty

  • Overall, world poverty is DECREASING

3. Per Worker Production Function (PWPF)

What it Measures

  • The PWPF shows Output per worker (Y/L) on the vertical axis
  • Capital per worker (K/L) on the horizontal axis
  • It does NOT show: prices of intermediate goods, inflation, consumer sales, or L/pop

Movement Along the Curve vs. Shift

Movement Along the Curve (change in K/L):

  • Increase in existing capital → movement to the RIGHT along the curve
  • Represents diminishing marginal returns: each additional unit of K/L adds less Y/L
  • Both shifts AND movements can show diminishing marginal returns — FALSE; only movement along the curve shows this Shift of the Curve (change in A — Technology):
  • Higher college graduation rates → curve SHIFTS UP (human capital = tech improvement)
  • Better organized businesses → curve SHIFTS UP
  • Increase in technology/efficiency → curve SHIFTS UP
  • Inflation — NO effect on PWPF
  • More sales to consumers — NO effect on PWPF

Technology (A) and the PWPF

  • Technology = increasing EFFICIENCY of production WITHOUT increasing capital
  • It is NOT: more computers/devices (that is capital), not more workers
  • An increase in A DIRECTLY affects Y/L (shifts the PWPF)
  • An increase in A INDIRECTLY affects Y/pop (through the Y/L term in Y/pop = L/pop × Y/L)
  • Best example of technology: J&J introducing a new medicine (not buying more MacBooks)

4. Long-Run Growth

Most Significant Factor for Long-Run Growth

  • A (Technology / Total Factor Productivity) is the most significant driver
  • The Soviet Union grew by increasing K (capital), but stalled because it lacked technology growth

Human Capital

  • Increasing human capital (e.g., higher college graduation rates) acts like technology — shifts PWPF up
  • If human capital rises, Y/L and Y/pop are MOST LIKELY to rise (not necessarily K/L directly)

GDP Components — Which Drives Long-Run Growth?

  • Rapidly increasing INVESTMENT (I) leads to the highest long-run economic growth rate
  • Components of GDP: C (Consumption) + I (Investment) + G (Government) + NX (Net Exports)

When to Use Which Growth Formula

Situation Formula to Use Growth between two specific years (e.g., 2018 to 2023) Average Annual Growth Rate Simple one-period change Percent Change How long to double GDP? Rule of 70: 70 ÷ avg annual growth rate

Question Answer Natural resources _____ economic growth. Don’t really affect it Netflix replacing Blockbuster is an example of ___. Creative destruction Which GDP component drives long-run growth most? Investment (I)

6. Study Tips & Reminders - Read the assigned articles before the quiz - Review the Learning Goals posted on Canvas - Browse through Perusall for key readings - Complete all homework and practice quizzes - Remember: SHIFT = change in A (technology/efficiency/human capital); MOVEMENT = change in K/L (capital) - Remember the formula chain: Y/L = A(K/L)^0.3 → plugs into → Y/pop = (L/pop)(Y/L) - For growth rate problems across multiple years: always use the Average Annual Growth Rate formula - The Rule of 70 only works with the average annual growth rate (not percent change) Good luck on Quiz 4! — Prepared from GSG Session Materials (Sophia, Econ 104)