Comprehensive Study Guide for Macroeconomic Aggregate Supply Models and Objectives

Evaluation of Aggregate Supply Models and Macroeconomic Dynamics

• Classroom Management and Pedagogy: "Addition by Subtraction"

  • The instructor notes that the class may function better and be more productive in the absence of certain students, a concept described as "addition by subtraction."
  • The instructor emphasizes the importance of active participation and note-taking, warning that students who ignore class discussions often perform poorly (e.g., scoring 50 on midterms) despite the material being "unscrew-up-able" if attention is paid.
  • Students are encouraged to ask questions individually rather than in a group to avoid giving away high-level answers to those not thinking at that level yet.

• Review of Previous Exams and Answer Keys

  • The instructor declines to provide a formal answer key to previous tests but explains that he is systematically going through previous test questions in class, effectively providing the answers to those who take notes.

Section 4: Monetarist/New Classical Perspective on Aggregate Demand Shifts

• Monetarist and New Classical Equivalency

  • Monetarist and New Classical models are treated as one and the same in this context.
  • The primary concern in this model is the Long-Run Aggregate Supply (LRAS) curve.

• Impact of Decreasing Aggregate Demand ($AD$)

  • In the Monetarist/New Classical model, the LRAS curve is perfectly vertical.
  • Ultimately, when $AD$ decreases (shifts to the left):
    • The price level ($P$) decreases.
    • The Real Gross Domestic Product ($GDP$ or $Y$) remains unchanged (no change).

• Impact of Increasing Aggregate Demand ($AD$)

  • When $AD$ increases (shifts to the right):
    • The price level ($P$) increases.
    • The Real $GDP$ remains unchanged at the potential output level.

• Short-Run vs. Long-Run Transitions

  • If a question asks for a step-by-step shown in multiple stages, the student must shift the $AD$ curve first, followed by the Short-Run Aggregate Supply ($SRAS$) curve to return to the vertical LRAS.
  • If only the final outcome is requested, the Monetarist belief is that changes in $AD$ only impact price levels, not real output.

Section 4: Keynesian Perspective on Aggregate Demand Shifts

• The Three Sections of the Keynesian Curve

  • The Keynesian Aggregate Supply ($AS$) curve is divided into three distinct regions:
    • Section 1: Horizontal section (high unemployment/excess capacity).
    • Section 2: Upward-sloping section (approaching full employment).
    • Section 3: Vertical section (full employment/physical limit).

• The "It Depends" Principle

  • Unlike the Monetarist model, the outcome of an $AD$ shift in a Keynesian model depends entirely on which section of the curve the economy is currently inhabiting.
  • Case: Decrease in $AD$ in Section 1:
    • The price level remains unchanged due to downward price inflexibility.
    • Real $GDP$ decreases.
  • Case: Decrease in $AD$ in Section 3:
    • The price level decreases.
    • Real $GDP$ remains unchanged.
  • Case: Increase in $AD$ in Section 2:
    • Both the price level and Real $GDP$ will increase, though the price increase may be less dramatic than in Section 3.

Section 5: Long-Run Aggregate Supply and Potential Output

• Diagramming Economic Growth

  • Economic growth is represented by a rightward shift of the LRAS curve.
  • This shift indicates an increase in the potential output (also known as full employment output).
  • The instructor notes that while diagramming, students should show potential output shifting alongside the curve.

• Growth without Inflation

  • To show economic growth without inflation, the $AD$ and $SRAS$ curves must shift alongside the LRAS in a manner that they all intersect at the original price level.
  • This represents an increase in output capacity without upward pressure on prices.

• Macroeconomic Contraction

  • While rare, the LRAS and potential output can shift to the left, indicating a reduction in the economy's productive capacity.

• Connection to Production Possibilities Curve ($PPC$)

  • A rightward shift in the LRAS is the analytical equivalent of an outward shift of the $PPC$ boundary.

• Keynesian LRAS Shifts and Price Inflexibility

  • In the Keynesian model, when potential output increases, the horizontal section of the curve shifts to the right but stays horizontal.
  • The price level does not drop because of "sticky prices" or fixed costs.
  • Fixed Costs Examples:
    • Taxes.
    • Labor costs: Labor costs do not easily fall. Minimum wage laws prevent wages from reversing or dropping quickly.

Section 5: Factors Shifting Aggregate Supply in the Long Term

• Core Drivers of LRAS Shifts

  • The long-term movement of the Aggregate Supply curve is driven by changes in the quantity and quality of the Factors of Production.

• Technological Improvements (Capital)

  • Improvements in physical capital and technology allow more work to be completed faster.
  • Example: Communication technology (transitioning from typewriters/stamps to instant electronic notes) and WiFi improvements in schools allow for increased productivity.

• Labor Quality (Human Capital)

  • Improving the proficiency of the workforce through education and training.
  • Example: A government initiative focused on STEM (Science, Technology, Engineering, and Math) that requires students to be truly proficient in math rather than just passing will create more capable workers over an 18-to-22-year timeline as they enter the workforce.

• Labor Quantity

  • Increasing the number of people in the labor force.
  • Methods to Increase Quantity:
    • Decreasing the minimum working age (e.g., lowering the requirement from 16 to 15).
    • Delaying retirement age (e.g., increasing social security eligibility from 67 to 70).
    • Immigration policies: Facilitating legal employment for those in the country or allowing more people into the country.
  • Wage Incentives: Increasing pay in certain fields may entice people to enter those sectors, but the fundamental quantity of labor available to the economy is often dictated by legal and demographic factors.

Section 6: Comparative Analysis of Models

• Monetarist View on $AD$ and Price Level

  • In the Monetarist model, an increase in $AD$ always leads to an increase in the price level because the LRAS curve is perfectly vertical.
  • Conversely, a decrease in $AD$ always leads to a decrease in the price level.

• Keynesian View on $AD$ and Price Level

  • In the Keynesian model, an increase in $AD$ sometimes, but not always, leads to an increase in the price level.
  • It depends on the section:
    • Horizontal section: Never leads to a price increase.
    • Upward-sloping/Vertical sections: Always leads to a price increase.

Chapter 10: Macroeconomic Objectives

• The Four Primary Objectives

  1. Low and Stable Rate of Inflation: Directly relates to the vertical axis of the $AD/AS$ model.
  2. Economic Growth: Reflected in the increase of Real $GDP$.
  3. Low Unemployment Rate: Maintaining a high level of employment within the labor force.
  4. Sustainable Level of Debt: This is a newer addition to the syllabus. Debt itself is not negative (it is used for college, cars, and houses), but unsustainable debt interferes with future resource use. This objective does not show up as clearly on the standard $AD/AS$ model.

• Equity and Income Distribution

  • Equity (fairness) is a subjective and changeable objective found in previous versions of the syllabus.
  • Fairness is interpreted differently: some believe innovators (e.g., creators of Amazon) deserve billions, while others believe wealth gaps are inherently unfair.
  • Politicians often appeal to the emotion of jealousy when discussing equity.

Defining Unemployment and Underemployment

• Underemployment

  • Underemployed individuals are not counted as unemployed in labor statistics; they are counted as employed.
  • Types of Underemployment:
    1. Over-qualification: A worker has skills or education higher than what their current job requires (e.g., a person with a management-capable degree working the fryer at a fast-food restaurant).
    2. Involuntary Part-Time Work: Working fewer hours than desired (e.g., a student wanting 40 hours a week but only being scheduled for 10 hours so the employer can avoid paying benefits).

• Unemployment Definition (The Three-Part Test)

  • To be technically classified as unemployed, an individual must meet three criteria concurrently:
    1. Of Working Age: Typically defined by national or regional laws (e.g., 16–64). Children (e.g., age 8) are not unemployed.
    2. Willing and Able to Work: This means the individual is actively seeking a job and interested in employment. Someone sitting on the couch without interest in working is not part of the labor force and therefore not unemployed.
    3. Without a Job: They must not currently hold employment.

• Unemployment Benefits

  • To collect benefits, individuals often must provide proof of effort, such as attending interviews and documenting job applications.

Questions & Discussion

• Zander: Asked an "obnoxious unrelated question" regarding an answer key, which the instructor is answering through daily reviews.
• Giselle: Corrected identified that in the Keynesian model, whether aggregate demand affects price or $GDP$ "depends" on the section.
• Leo and Zidane: Questioned about the specific outcomes of Keynesian model shifts; the instructor used their lack of attention as a teaching moment regarding the "it depends" answer.
• Fernando: Left class for the health center due to a back injury.
• Alan Cooper (Hypothetical/Metaphor): Used as a recurring example of a person not in the labor force (sitting in a basement, not looking for work, making excessive demands for meatloaf).