October 3 Economics review

Introduction to Macroeconomics

• Personal Anecdote: Relates to past experience as a teaching assistant (TA) for a macroeconomics class.

  • TA was responsible for the administration of the course due to the professor's neglect.

  • The professor had previously served as an economic adviser to President Eisenhower in the 1980s, indicating his long tenure in economics.

Challenges with Exam Structure

• Professor's Final Exam Format:

  • Composed of 66 multiple choice questions to be completed in 50 minutes.

  • This diverged from previous exams which only included fill-in-the-blank and short answer questions.

  • Errors of Omission and Commission Instructions:

  • Questions could have multiple correct answers, leading to the complexity of grading.

  • Possible answers included options from none to all available choices.

  • A wrong answer would incur a negative scoring penalty (e.g. choosing option C when the correct answer was B resulted in losing half a point).

• Concerns Raised:

  • The TA expressed concern that students had never experienced this kind of exam format and would be unfairly graded.

  • The department chair dismissed these concerns, indicating the professor would retire soon and wished to avoid conflict.

• Outcome:

  • The class's average score ended up being -33%, illustrating the exam's difficulty.

  • In response, the professor decided to add 99 points to everyone's score to adjust for grading discrepancies rather than reconsidering the exam's fairness.

Importance of Study Focus

• Structure of Exam Content:

  • Emphasis on logical organization of study material, derived from mathematical training.

  • The exam material would align closely with what was taught in lectures.

• Study Topics:

  • Introduction to Economics:

  • Definition of economics and economic choices.

  • Differences between positive and normative economics.

  • Economics as a science.

  • Factors of production and production costs.

  • Comparative advantage and production possibility frontier.

  • Market Dynamics:

  • Players involved in market interactions and their motives.

  • Assumption of rationality among players.

  • Institutions and flow of certainty in economics.

  • Supply and Demand Analysis:

  • Understanding the difference between quantity demanded and demand.

  • Differences between quantity supplied and supply.

  • Grasping concepts of equilibrium, price ceilings, and price floors.

  • Understanding and calculating elasticity.

  • Relationship of elasticity to total revenue and tax revenue implications.

• Chapters Covered:

  • Focus is primarily on Chapters 1 to 5 from the textbook.

  • The TA emphasized that they had prepared the exam based solely on lecture notes and not the textbook to ensure a realignment with classroom discussions.

Personal Examination Experiences

• Honors Calculus Class:

  • Personal experience in a first university calculus course, described as less engaging, with a peculiar professor.

  • The final exam was offered on December 11, 1979 at 08:00, reminiscent of stress-induced memories during exams.

  • The professor’s eccentric nature included distributing chocolates during the exam, which exemplified unconventional teaching behavior.

  • The professor’s backhanded critique during the exam caused personal discomfort and a drop in confidence despite correct answers being provided.

Classroom Environment and Exam Procedures

• Exam Guidelines:

  • The TA reassured students that the grading process would be fair and that they would not face undue scrutiny while completing exams.

• Identified common references used in class materials, drawing from fictional characters or humorous names, indicating a light-hearted approach toward complex concepts.

Budget Constraints in Economics

Budget Constraint Equation:

• General Case:
  $ext{Income} = ext{sum from } i=1 ext{ to } n ext{ of } p<em>i q</em>i$

• Rearranged Equation for Graphical Representation:

  • $p<em>2 q</em>2 = ext{Income} - p<em>1 q</em>1$

  • To express $q<em>2$ in terms of other variables: $q</em>2 = rac{ ext{Income}}{p<em>2} - rac{p</em>1}{p<em>2}q</em>1$

  • Graphical Analysis:

• The axes are labeled with q1 on the x-axis and q2 on the y-axis.

• Intercepts calculated under scenarios where consumer only purchases one good.

• The budget constraint is depicted as a straight line, illustrating the combinations of two goods available for purchase within the consumer's budget.

Consumer Equilibrium Considerations

• Defining Consumer Equilibrium:

  • Occurs when consumers do not have any incentive to change their consumption bundles, implying optimal satisfaction achieved under the given budget.

  • First condition: All income must be spent (no borrowing or savings).

  • Second condition: Known as equal marginal principle or Gossen's law, establishing that marginal utility per dollar should be equalized across goods to maximize satisfaction.

• The rationale behind this is based on the consumer reallocating budget until marginal utility per dollar spent on both goods is equal. For example:

  • If: rac{ ext{MU1}}{p1} > rac{ ext{MU2}}{p2}

  • It follows that consumers should buy more of good 1 and less of good 2.

• Illustrative Example:

  • Marginal utility decreasing as quantity of good increases; thus, total satisfaction stabilizes at an equilibrium point.

Additional Points on Demand Curves and Preferences

• Moving Toward Demand Curves:

  • Process described as input to a mathematical model or ‘black box’ that takes consumer preferences, prices, and income to derive quantities purchased for different price points.

  • An increase in price leads to a reallocation of budget, demonstrating changes in quantities that align with new price expectations, reinforcing the principles of demand curves.

Conclusion

In conclusion, these notes reflect a long and detailed discussion on several economic concepts primarily surrounding macroeconomic principles, consumer behavior, the structure of exam questions, and personal experiences related to teaching and examinations.