8/27/26

Event Announcements and Class Overview

• Athletics Announcement:

  • The men's and women's soccer teams are hosting the institution's first-ever home soccer game.

  • Match Location: David Gates Stadium in Rogers, located at $1516$ South $6\text{th}$ Street.

  • Match Schedule: Women's game starts at $5:00\text{ PM}$, and Men's game starts at $7:00\text{ PM}$.

  • Assistant Referee Insights: Officiating soccer matches and managing spectator/parent interactions presents unique operational challenges.

• Macroeconomics Course Details:

  • Course Subject: Macroeconomics.

  • Class Enrollment: Total enrolled student count is $22$ students.

  • Course Schedule: Class session concludes at $1:15\text{ PM}$.

Mental Math Shortcut: Squaring Numbers Ending in 5

• General Mathematical Rule:

  • To multiply two identical two-digit numbers ending in $5$ (or square any number ending in $5$) expressed as $(10N + 5)^2$:

  • The final two digits of the product are always $25$.

  • The leading digits are calculated by multiplying the tens digit $N$ by the next consecutive integer $(N + 1)$.

  • Mathematical Formula: $(10N + 5)^2 = 100 \times N(N + 1) + 25$.

• Step-by-Step Numerical Demonstrations:

  • $25 \times 25$:

  • Ending digits: $5 \times 5 = 25$.

  • Leading digits: 2 \times (2 + 1) = 2 \times 3 = 6$.\n - Result: 625.\n - 35 \times 35:\n - Ending digits: 25$.

  • Leading digits: 3 \times (3 + 1) = 3 \times 4 = 12$.\n - Result: 1225.\n - 45 \times 45:\n - Ending digits: 25$.

  • Leading digits: 4 \times (4 + 1) = 4 \times 5 = 20$.\n - Result: 2025.\n - 55 \times 55:\n - Ending digits: 25$.

  • Leading digits: 5 \times (5 + 1) = 5 \times 6 = 30$.\n - Result: 3025.\n - 65 \times 65:\n - Ending digits: 25$.

  • Leading digits: 6 \times (6 + 1) = 6 \times 7 = 42$.\n - Result: 4225.\n - 75 \times 75:\n - Ending digits: 25$.

  • Leading digits: 7 \times (7 + 1) = 7 \times 8 = 56$.\n - Result: 5625$.

Economic Concepts: Normal vs. Inferior Goods

• Normal Goods:

  • Definition: Goods for which demand has a direct (positive) relationship with consumer income ($I$).

  • Relationship Dynamics:

  • An increase in income ($I \uparrow$) results in an increase in quantity demanded ($Q_d \uparrow$).

  • A decrease in income ($I \downarrow$) results in a decrease in quantity demanded ($Q_d \downarrow$).

  • Explicit Examples:

  • Automobiles / Cars.

  • Dogs / Pets.

  • Sunglasses.

  • Shoes.

  • Premium specialty coffee.

• Inferior Goods:

  • Definition: Goods for which demand has an inverse (negative) relationship with consumer income ($I$).

  • Relationship Dynamics:

  • An increase in income ($I \uparrow$) leads to a decrease in quantity demanded ($Q_d \downarrow$) as consumers shift toward higher-quality alternatives.

  • A decrease in income ($I \downarrow$) leads to an increase in quantity demanded ($Q_d \uparrow$).

  • Explicit Examples:

  • Ramen noodles (used as a budget/survival food staple).

  • Canned food products.

  • Generic / store-brand products.

  • Discount grocery items.

Class Roll Call and Classroom Discussions

• Student Roster:

  • Brenda, Thumb, Leslie, Ellen, Amy, Cindy, April, Jack, Jackie, Matt (fisherman), Joshua, Bert, Jack Heaps, Jack Cougar, Zach, Samantha, Colton, Alexander, Diego, Fernando, Nadia, Ulysses.

• Student Anecdotes and Background Context:

  • Twin City Ice Cream Business:

  • Ice cream shop in Minneapolis: Izzy's Ice Cream.

  • Notable flavor: Mango Jango.

  • Seasonal demand variance: High customer traffic during summer; minimal shop traffic in winter due to freezing outdoor temperatures.

  • Personal Vehicles and Observations:

  • Student Nadia drives a Kia Soul.

  • Morning routine observation: Ordering Starbucks beverages and McDonald's breakfast prior to morning gymnastics.

  • Regional Commodity Rankings:

  • Arkansas is ranked $1\text{st}$ in the United States for rice production.

  • Arkansas is ranked $2\text{nd}$ or $3\text{rd}$ in the United States for chicken production.

  • Culinary Contexts:

  • Philadelphia sushi rolls consist of salmon, cream cheese, and avocado.

Determinants of Quantity Demanded vs. Shifts in Demand

• Three Factors Affecting Movement Along the Demand Curve (Quantity Demanded):

  • Income Effect: A change in the price ($P$) of a product affects real purchasing power, altering the quantity demanded ($Q_d$) along the existing demand curve.

  • Law of Diminishing Marginal Utility: As a consumer purchases additional units of a good, the incremental utility gained from each additional unit declines, requiring lower prices to incentivize further consumption.

  • Substitution Effect: A change in the relative price of a good compared to substitute goods prompts consumers to adjust their purchasing quantities along the curve.

• Five Non-Price Determinants Shifting the Demand Curve (Overall Demand):

  • Tastes and Preferences: Shifts in trends, popularity, or health awareness shift the demand curve to the right ($D_1 \rightarrow D_2$) for positive changes or to the left for negative changes.

  • Income:

  • For Normal Goods: $I \uparrow \implies$ Rightward shift ($D_1 \rightarrow D_2$); $I \downarrow \implies$ Leftward shift.

  • For Inferior Goods: $I \uparrow \implies$ Leftward shift; $I \downarrow \implies$ Rightward shift ($D_1 \rightarrow D_2$).

  • Number of Consumers: Market expansion due to population growth, immigration, or seasonal tourism shifts demand to the right.

  • Expectations: Consumer forecasts regarding future prices, income levels, or availability shift current market demand.

  • Prices of Related Goods: