D2.Eco.10.6-8: How Interest Rates Affect Borrowing and Investing
In plain English: D2.Eco.10.6-8 is the C3 Framework economics indicator for grades 6-8 that asks students to explain how changes in interest rates influence borrowing and investing. Students learn that higher rates make loans cost more, so households borrow less and businesses buy fewer new machines and buildings, while lower rates do the opposite and savers earn less.
Explain the influence of changes in interest rates on borrowing and investing.
C3 Framework for Social Studies (NCSS) · Dimension 2: Applying Disciplinary Concepts and Tools · Discipline: Economics · The National Economy · Official standard
D2.Eco.10.6-8 asks students to explain how changes in interest rates influence borrowing and investing. An interest rate is the price of borrowing money, written as a percent of the amount borrowed for one year. When rates rise, every loan costs more, so families borrow less for cars and houses, and businesses think twice before borrowing to buy trucks, machines or buildings. In economics, that kind of business spending on tools for future production is called investment. When rates fall, borrowing is cheaper, and more of these purchases make sense. Savers feel the change the other way: higher rates pay them more for leaving money in the bank.
Students read a short Federal Reserve explanation of how its interest-rate decisions reach households and businesses (Source 1), work with real data from the Federal Reserve on car-loan rates, credit-card rates and consumer borrowing from 2021 to 2025 (Source 2), and analyze an invented scenario about three decisions in one town (Source 3). In the activities, students decide whether to borrow or wait, test which business projects still pay at different rates, and graph the real data.
Learning Objectives
By the end of this lesson, students will be able to:
Define interest, an interest rate, borrowing and business investment
Explain why higher interest rates lead households and businesses to borrow less, and lower rates to borrow more
Explain how a change in interest rates changes whether a business investment pays off
Describe how savers are affected differently from borrowers
Use real Federal Reserve data to describe how rates and borrowing changed from 2021 to 2025, and name limits of the data
Prior Knowledge Required
Students should already be comfortable with:
Explaining the roles of buyers and sellers in financial markets D2.Eco.3.6-8
Explaining how supply and demand change prices, including the price of credit D2.Eco.6.6-8
"You want a $300 bike now. A store will let you pay later, but you must pay back $315 in a year. Another store wants $345 back. Which deal would you take, and would you still buy the bike now if only the second deal were available?"
Take answers. Point out that the extra $15 or $45 is interest, and that $15 on $300 is a 5% rate while $45 is 15%. Ask how many students would wait if only the 15% deal existed. Tell students that D2.Eco.10.6-8 asks them to explain how changes in interest rates affect borrowing and investing.
Direct Instruction15-20 minutes
Key terms for D2.Eco.10.6-8 (working definitions)
Term
Meaning
Example (invented)
Interest
Money a borrower pays a lender for the use of money, on top of paying the loan back
$60 paid on a $1,000 loan
Interest rate
Interest for one year as a percent of the amount borrowed
6% a year
Borrowing
Getting money now and promising to pay it back later, with interest
A car loan, a student loan, a business loan
Investing (by a business)
Spending on capital goods, the tools, machines and buildings used to produce more later
A bakery buying a bigger oven
Saving
Keeping income instead of spending it; banks pay savers interest
$500 in a savings account
Federal Reserve (the Fed)
The central bank of the United States; it raises or lowers a key short-term interest rate
Raising its target rate to slow spending
Part 1: The price of borrowing. Treat the interest rate like any price. When a price goes up, people buy less; when the price of borrowing goes up, people borrow less. Show Diagram 1. The Federal Reserve sets a target for one short-term rate, and banks' rates for cars, homes and businesses tend to follow it, though not one for one.
Part 2: Two kinds of decisions. A household asks, "Can we afford the monthly payment?" A business asks, "Will this machine earn more than the interest it costs?" If a project's yearly return is higher than the interest rate, borrowing for it pays; if the rate rises above the return, the project is dropped. Savers ask a third question: "Is it worth waiting?" Work these examples.
Borrowing for one year (invented)
Invented example: Jordan borrows $1,000 for one year. How much interest does he pay if the rate is 5%? If it is 12%?
Result: 5%: 0.05 x $1,000 = $50. 12%: 0.12 x $1,000 = $120. The same loan costs $70 more at the higher rate, so some borrowers will decide to wait or borrow less.
A car loan at real rates (invented loan)
Invented example using real average rates from Source 2: a $25,000 new-car loan paid back in 60 monthly payments. A loan calculator gives $469.72 a month at 4.82% (the 2021 average) and $508.83 a month at 8.16% (the 2024 average). How much more does the buyer pay each month, and in interest over the whole loan?
Result: Each month: $508.83 - $469.72 = $39.11 more. Total paid: $469.72 x 60 = $28,183.20 and $508.83 x 60 = $30,529.80, so total interest is $3,183.20 and $5,529.80. The higher rate adds $2,346.60 in interest. Some buyers choose a cheaper car, keep their old one longer, or wait.
A business investment (invented)
Invented example: a pizza shop can borrow $30,000 for a new oven. The oven will add $1,800 a year to profit. Should the shop borrow if the rate is 4%? If it is 8%?
Result: The oven's return: $1,800 / $30,000 = 6% a year. At 4%, interest is 0.04 x $30,000 = $1,200, less than $1,800, so the oven pays for itself with $600 to spare. At 8%, interest is $2,400, more than $1,800, so the shop would lose $600 a year and will probably wait. Higher rates mean fewer business investments.
A saver (invented)
Invented example: Mia has $2,000 in savings. How much interest does she earn in a year at 0.5%? At 4%?
Result: 0.5%: 0.005 x $2,000 = $10. 4%: 0.04 x $2,000 = $80. Higher rates reward saving, so some people save more and spend or borrow less. Lower rates do the opposite.
Teacher tip. Students sometimes think higher rates hurt everyone. Ask: "Who receives the interest?" Lenders and savers gain when rates rise; borrowers pay more. Also stress that rates are one reason among many: a family that needs a car may still borrow at a high rate.
Guided Practice15 minutes
Source 1: how the Fed's rate reaches families and businesses. Context note: Source 1 is from the website of the Federal Reserve Board in Washington, D.C. The Fed's job includes keeping prices stable and helping as many people as possible find work. It is written to explain the Fed's tools, not to argue for any particular decision. Read Source 1 aloud. Glossary: "monetary policy" (the Fed's actions on interest rates and the money supply), "inflation" (a general rise in prices), "employment" (how many people have jobs), "credit" (borrowed money), "overnight borrowing" (loans that last one night), "spurs" (pushes, encourages), "economic downturns" (periods when the economy shrinks and jobs are lost), "linkages" (connections).
1As the Federal Reserve conducts monetary policy, it influences employment and inflation primarily through using its policy tools to affect overall financial conditions—including the availability and cost of credit in the economy.
2The Fed's primary tool to conduct monetary policy is the federal funds rate—the rate that banks pay for overnight borrowing in the federal funds market. Changes in the federal funds rate influence other interest rates that in turn influence borrowing costs for households and businesses as well as broader financial conditions.
3For example, when interest rates go down, it becomes cheaper to borrow, so households are more willing to buy goods and services, and businesses are in a better position to purchase items to expand their businesses, such as property and equipment. Increased spending by households and businesses creates greater demand for the goods and services that businesses produce, which spurs them to hire more workers, influencing employment. And the stronger demand for goods and services may push wages and other costs higher, influencing inflation. During economic downturns, the Fed may lower the federal funds rate to near zero. In such times, the Fed can use other tools to influence financial conditions in support of its goals.
4However, there are many factors that affect inflation and employment. And while the linkages from monetary policy to both inflation and employment are not direct or immediate, monetary policy is an important factor.
Board of Governors of the Federal Reserve System (US government work), How does the Federal Reserve affect inflation and employment? (Source 1: from interest rates to borrowing and spending) (2024). US government work (17 U.S.C. 105). Source text.
The starting point. Prompt: in paragraph 2, what is the federal funds rate, and how does it reach ordinary families? Teacher note: changes in it "influence other interest rates that in turn influence borrowing costs for households and businesses." Families do not borrow at the federal funds rate, but their banks' rates tend to follow it.
Make a chain. Prompt: turn paragraph 3 into a chain of arrows that starts with "interest rates go down." Teacher note: check that every arrow matches a phrase in paragraph 3 and that the chain ends with effects on jobs and prices. Pairs draw the chain, then draw the opposite chain for "interest rates go up."
A caution. Prompt: what does paragraph 4 warn about? Ask students to put the warning in their own words. Keep their answers for the quiz review.
Independent Practice15 minutes
Source 2: real data on borrowing. Source 2 is real data, not invented. The interest rates and borrowing growth come from the Federal Reserve Board's G.19 Consumer Credit release of September 8, 2026, and the target ranges from the Federal Reserve Board's list of rate decisions (federalreserve.gov, US government works). The target range is the range the Fed aims for in the federal funds rate. A credit card lets people borrow up to a limit and pay back over time. Nonrevolving consumer credit means loans with set payments, mostly car loans and student loans. A change in a rate is measured in percentage points: a rate that rises from 4% to 6% has gone up 2 percentage points.
Source 2: Interest rates and consumer borrowing, 2021-2025 (Federal Reserve Board, real data)
Year
Fed target range at year end
60-month new-car loan rate at banks
Credit-card rate (all accounts)
Growth in nonrevolving consumer credit
2021
0-0.25%
4.82%
14.60%
5.4%
2022
4.25-4.50%
5.36%
16.26%
5.4%
2023
5.25-5.50%
7.83%
20.90%
0.6%
2024
4.25-4.50%
8.16%
21.58%
1.2%
2025
3.50-3.75%
7.65%
21.22%
1.8%
Source 2: Board of Governors of the Federal Reserve System, G.19 Consumer Credit (release of September 8, 2026), Terms of Credit and percent changes at an annual rate; and Open Market Operations, "FOMC's target federal funds rate or range" (federalreserve.gov). Loan rates are yearly averages of what banks charged; "growth" is the percent increase in the amount owed during the year, adjusted by the Fed for breaks in the data. The Fed raised its target range in steps from March 2022 to July 2023, then lowered it in 2024 and 2025. Diagram 2 graphs the car-loan rates.
Students answer on their own: (1) By how many percentage points did the credit-card rate change from 2021 to 2024? (2) Which column moved in the opposite direction from loan rates between 2022 and 2023? (3) Write one sentence that starts "The data suggest..." and one that starts "But the data cannot prove...". Collect the answers; Quiz questions 6-9 use Source 2.
Closure10 minutes
Three decisions. Introduce Source 3, an invented scenario, for the quiz and the homework. Students read it once on their own.
1Invented scenario, written for this page. Harbor Point is a fictional town. This year, interest rates at its banks are higher than they were two years ago. Here is how three of its residents are deciding what to do.
2The Okafor family needs a used car. They want to borrow $20,000 and pay it back in 48 monthly payments. A loan calculator shows a payment of $451.58 a month at 4% interest, the rate two years ago, and $488.26 a month at 8%, the rate their bank offers now. Their budget allows no more than $470 a month for a car payment.
3Lena's Landscaping wants to buy a new truck for $36,000, using a one-year bank loan that Lena would keep renewing. Lena expects the truck to let her take on more customers and add $2,520 a year to her profit. Two years ago her bank charged 5% a year on business loans. Now it charges 9%.
4Mr. Diaz has $5,000 in a savings account. Two years ago the account paid 0.5% interest a year. Now it pays 4.5%. He had planned to spend $2,000 of his savings on a new sofa, but he is thinking of waiting a year.
SVHS (invented scenario written for this page), Three Decisions in Harbor Point (Source 3: invented scenario). Original passage written for this page.
Exit ticket: Interest rates in your town just went up. Name one person or business who might borrow less, one who might invest less, and one who might be better off. Give a reason for each.
Teacher note on the sources: Source 1 is the Federal Reserve Board's own plain-language explanation. Source 2 is real Federal Reserve data through 2025; the Fed's newest decisions and the debates around them are left out on purpose, so the lesson stays about how interest rates work, not about whether any recent decision was right. Source 3 is invented. People disagree about when the Fed should raise or lower rates; this indicator asks students to explain the effects of a change, not to judge a particular decision. Interest is treated as simple yearly interest except where a loan calculator is used.
Differentiation Strategies
For Struggling Students
Give a three-column organizer: Borrowers, Businesses that invest, Savers, with rows for "When rates go up" and "When rates go down"
Use the sentence frame: "When interest rates rise, borrowing costs more, so ___ will probably ___."
Practice percents of money with friendly numbers ($100, $1,000) before using the scenario's numbers
For Advanced Students
Use Source 2 to explain why the 2022 car-loan rate rose much less than the Fed's target range that year. Think about when during the year the Fed acted
Explain why a family that badly needs a car may borrow even at a high rate, and what that shows about the limits of the interest-rate effect
Compare the credit-card and car-loan rates in Source 2 and suggest one reason lenders charge more on credit cards
Assessment Guidance
What to Look For
Strong answers treat the interest rate as the price of borrowing and trace the effect step by step: a higher rate raises the cost of a loan, so households borrow less and businesses drop investments whose return is lower than the rate; a lower rate does the opposite. They separate borrowers from savers, support each point with a quotation, a number from the real data or a calculation from the scenario, and avoid claiming that rates are the only cause. Watch for two confusions: thinking that "investing" in this indicator only means buying stocks, and treating the Fed's rate as the rate families pay.
02
Classroom Activities
3 Activities
1
Borrow Now or Wait?
15 minPairs
Pairs read 8 invented decision cards. For each card they decide whether the person or business should borrow now or wait, first at a low rate (4%) and then at a high rate (10%), and write one reason.
The 8 Decision Cards (invented)
A family wants to borrow $10,000 to redo a kitchen that works fine.
A delivery company's only van broke down; a new one costs $40,000.
A farmer could borrow $50,000 for a barn that would add $4,500 a year to profit.
A teen wants to put a $600 phone on a credit card.
A bakery could borrow $20,000 for a second oven that would add $1,000 a year to profit.
A college student needs a $5,000 loan to finish a nursing degree.
A city could borrow $2,000,000 to build a new library.
A couple wants to borrow $300,000 to buy their first home.
Sample Answers for the Teacher
Cards 3 and 5 can be checked with numbers. Card 3: $4,500 / $50,000 = 9%, so the barn pays at 4% but not at 10%. Card 5: $1,000 / $20,000 = 5%, so the oven pays at 4% but not at 10%.
Cards 2 and 6 are needs: many people borrow even at 10% because waiting costs more (lost business, a delayed career).
Cards 1, 4 and 8 are where higher rates most often lead people to wait or borrow less.
Card 7 shows that governments borrow too, and also pay more when rates rise.
Discussion Questions
Which cards changed from "borrow" to "wait" when the rate rose? What do they have in common?
Why did some borrowers decide to borrow even at 10%?
Modification for English Learners
Add a picture to each card and post the words borrow, loan, interest, rate, invest and save with a one-line definition in English and the student's home language.
2
The Interest Rate Dial
15 minWhole class
Each student gets one of 12 invented business project cards showing the project's yearly return, the profit it adds each year as a percent of its cost. The teacher "turns the dial" to three interest rates. A project goes ahead only if its return is higher than the rate.
Rate 4%: students whose project returns more than 4% stand up. (10 projects go ahead.)
Rate 8%: only returns above 8% stay standing. (5 projects.)
Rate 11%: only returns above 11% stay standing. (2 projects.)
Record the three counts on the board and draw a quick graph: interest rate across the bottom, number of projects up the side.
Debrief
What happens to total business investment as the rate rises? Why?
The projects that stopped did not disappear. What happens to them if the rate falls again?
What might happen to hiring when fewer projects go ahead?
Modification for a Shorter Class
Use only the 4% and 11% rounds.
3
Graph the Real Data
15 minGroups of 3
Groups graph two columns of Source 2, the car-loan rate and the growth in nonrevolving consumer credit, on the same set of years, and write a short data report.
Task
Draw two line graphs, one above the other, with the years 2021-2025 across the bottom.
Mark the years when the car-loan rate rose and when borrowing growth fell.
Write three sentences: one pattern you see, one explanation from Source 1, and one other thing that might have affected borrowing.
Discussion Questions
Did borrowing growth respond in the same year that the Fed raised rates, or later?
Why should we be careful about saying one line caused the other?
03
Diagrams & Visual Aids
2 diagrams
Diagram 1: How a Change in Interest Rates Spreads
A change in interest rates changes the monthly cost of loans. Households and businesses that borrow respond in one direction, and savers, who receive interest, in the other.
Diagram 2: Car-Loan Rates, 2021-2025 (Federal Reserve, real data)
Yearly average rate on 60-month new-car loans at commercial banks, from Source 2, drawn to scale, with the Fed's target range at the end of each year below. Bank rates follow the Fed's moves, but not one for one and not at once.
04
Homework Assignment
~30 min
D2.Eco.10.6-8 Homework: Interest Rates, Borrowing and Investing
Directions: Part 1 uses invented examples. Part 2 uses Sources 1-3 in the lesson plan. Show your work and answer in complete sentences.
Part 1: Rates and Decisions (Problems 1-3)
In three or four sentences, explain why a rise in interest rates usually leads people to borrow less. Use an invented example of a family deciding whether to borrow.
Invented example: Sam borrows $12,000 for one year. (a) How much interest does he pay at 5%? (b) At 10%? (c) How much more does the higher rate cost him?
Invented example: a print shop can borrow $60,000 for a machine that will add $4,800 a year to profit. (a) What is the machine's yearly return as a percent? (b) Find the yearly interest at 6% and at 10%. (c) At which rate should the shop buy the machine? Explain.
Part 2: Using the Sources (Problems 4-6)
Use Source 2. (a) By how many percentage points did the credit-card rate change from 2021 to 2023? (b) How did the growth in nonrevolving consumer credit change over the same years? (c) Give one reason, besides interest rates, that borrowing might have changed.
Use Source 1. In four or five sentences, explain how a decision by the Fed can end up changing whether a business buys new equipment. Quote paragraph 2 or paragraph 3 once.
Write a paragraph of 5-7 sentences: "When interest rates rise, who gains and who loses?" Use at least one detail from Source 3 and one number from Source 2.
Rubric
Criterion
Full Credit (2 pts)
Partial Credit (1 pt)
No Credit (0 pts)
Cause and Effect
Clearly explains how rate changes affect borrowing and investing
Effect stated without the reason
No clear explanation
Calculations
Problems 2-4 correct with work shown
One arithmetic slip
No work or several errors
Use of Sources
Quotation and data used accurately
Sources used loosely
No source evidence
Borrowers and Savers
Problem 6 explains both who gains and who loses
Only one side
Missing
05
Quiz: 20 Questions
Interactive, with answers
Instructions
Questions 1-5 and 20 use Source 1 (Federal Reserve Board) in Guided Practice. Questions 6-9 and 19 use Source 2 (real Federal Reserve data) in Independent Practice. Questions 10-15 and 17-18 use Source 3, the invented scenario in Closure, and Question 16 uses Sources 1 and 3. Your score updates as you answer, and Reset quiz clears everything.
Multiple choice: pick an option to check it. Short answer: write your answer, then reveal the model answer.
0 of 20 answered · 0 correct
Question 1 of 20 · Multiple Choice
In Source 1, paragraph 1, the Fed says it works mainly by affecting "overall financial conditions." Which part of financial conditions does the paragraph name?
Answer: B
Paragraph 1 says the Fed uses its tools to affect overall financial conditions, "including the availability and cost of credit in the economy." Credit means borrowed money, so the cost of credit is the interest rate. Choices A, C and D are not named in the paragraph; taxes are set by Congress, not the Fed.
Question 2 of 20 · Multiple Choice
According to Source 1, paragraph 3, when interest rates go down, what are businesses "in a better position" to do?
Answer: D
The paragraph says businesses "are in a better position to purchase items to expand their businesses, such as property and equipment." That spending on equipment and buildings is what economists call investment. Choices A, B and C are not in the paragraph; in fact, paragraph 3 says businesses hire more workers.
Question 3 of 20 · Multiple Choice
In Source 1, paragraph 3, what comes right after "greater demand for the goods and services that businesses produce"?
Answer: A
The chain is: lower rates, cheaper borrowing, more spending, greater demand, and then demand "spurs them to hire more workers." Choice B appears later in the paragraph, about economic downturns, not as the next step. Choice C reverses the effect described: lower rates make households more willing to borrow, not less. Choice D is not in the paragraph, which does not discuss savers; banks pay savers interest rather than charge them.
Question 4 of 20 · Multiple Choice
What warning does Source 1, paragraph 4, give?
Answer: C
Paragraph 4 says "there are many factors that affect inflation and employment" and that the links "are not direct or immediate." Choice A goes too far: the paragraph also says monetary policy "is an important factor." Choices B and D are not in the source and are not true.
Question 5 of 20 · Multiple Choice
Use the reasoning in Source 1, paragraph 3, in reverse. If interest rates go up, what is most likely?
Answer: B
If lower rates make borrowing cheaper and spending rise, higher rates make borrowing more expensive, so households and businesses borrow and spend less. Choice A is the effect of lower rates. Choice C ignores the warning in paragraph 4 that effects are not immediate. Choice D is the opposite of the chain: less demand means less hiring.
Question 6 of 20 · Multiple Choice
Use Source 2. By how many percentage points did the 60-month new-car loan rate rise from 2021 to 2024?
Answer: A
8.16% - 4.82% = 3.34 percentage points. Choice B is the percent change of the rate itself (3.34 / 4.82 is about 69%), not the change in points. Choice C adds the two rates. Choice D is the change from 2023 to 2024 only (8.16 - 7.83).
Question 7 of 20 · Multiple Choice
Use Source 2. By how much did the bottom of the Fed's target range rise from the end of 2021 to the end of 2023?
Answer: C
The bottom of the range rose from 0% to 5.25%, a rise of 5.25 percentage points. Choice A uses the top of the 2023 range. Choice B is the width of one range. Choice D is the change in the bottom from 2022 to 2023 only (4.25 to 5.25).
Question 8 of 20 · Multiple Choice
Which statement is supported by Source 2?
Answer: D
In every year the credit-card rate (14.60% to 21.58%) was well above the car-loan rate (4.82% to 8.16%). Choice A is wrong: car-loan rates rose every year from 2021 to 2024. Choice B is wrong: 2023 had the slowest growth, 0.6%. Choice C is wrong: the range was 4.25-4.50% in 2022 and 3.50-3.75% in 2025.
Question 9 of 20 · Multiple Choice
A student says, "Source 2 proves that higher interest rates alone caused borrowing to grow more slowly in 2023." What is the best response?
Answer: B
The data are consistent with the idea that higher rates slow borrowing, but a table of yearly numbers cannot rule out other causes, such as car prices, incomes or how much people had already borrowed. Source 1 itself warns that "there are many factors." Choice A confuses a reliable source with proof of cause. Choice C is wrong: growth fell from 5.4% to 0.6%. Choice D contradicts Source 1.
Question 10 of 20 · Multiple Choice
Use Source 3. Which loan fits the Okafor family's budget of $470 a month?
Answer: A
$451.58 at 4% is under $470, but $488.26 at 8% is over $470. The higher rate pushes the payment past their budget, so they may borrow less, choose a cheaper car or wait. Choice B reverses the rates. Choices C and D misread one of the two payments.
Question 11 of 20 · Multiple Choice
Use Source 3. Over all 48 payments, how much more would the Okafors pay at 8% than at 4%?
Answer: C
Each month: $488.26 - $451.58 = $36.68. Over 48 months: $36.68 x 48 = $1,760.64. Choice A is the monthly difference only. Choice B is the total interest at 8% ($488.26 x 48 - $20,000), not the difference. Choice D multiplies by 24 months instead of 48.
Question 12 of 20 · Multiple Choice
Use Source 3. At the bank's current 9% rate, by how much would Lena's yearly interest on the $36,000 loan be more than the profit the truck adds?
Answer: D
Interest: 0.09 x $36,000 = $3,240. Added profit: $2,520. Difference: $3,240 - $2,520 = $720 a year, so the truck would lose money. Choice A is the interest alone. Choice B is the interest at the old 5% rate. Choice C is the difference between the interest at 9% and at 5%.
Question 13 of 20 · Multiple Choice
Use Source 3. What is the highest interest rate at which Lena's truck would still pay for itself?
Answer: A
The truck's yearly return is $2,520 / $36,000 = 0.07, or 7%. At any rate up to 7%, the profit covers the interest. Choice B is today's rate, which is too high. Choice C is the old rate, at which the truck pays with money to spare, but it is not the highest. Choice D divides the other way ($36,000 / $2,520).
Question 14 of 20 · Multiple Choice
Use Source 3. How much more interest will Mr. Diaz's $5,000 earn in one year at today's rate than at the rate two years ago?
Answer: C
Now: 0.045 x $5,000 = $225. Two years ago: 0.005 x $5,000 = $25. Difference: $225 - $25 = $200. Choice A is today's interest alone, and Choice B is the old interest alone. Choice D finds 4.5% of the $2,000 he planned to spend instead of the $5,000 he has saved.
Question 15 of 20 · Multiple Choice
In Source 3, why might the higher interest rate lead Mr. Diaz to wait before buying the sofa?
Answer: D
At 4.5%, money left in the account earns more than it did at 0.5%, so waiting has a bigger reward. This is the saver's side of a rate change. Choices A and B are not in the scenario. Choice C is wrong: he would pay with savings, not a loan.
Question 16 of 20 · Short Answer
Using Source 1 and Source 3, explain how the rise in interest rates in Harbor Point affects the Okafor family's borrowing. Give one detail from each source.
Model answer: Source 1 explains that changes in the Fed's rate "influence other interest rates that in turn influence borrowing costs for households." In Source 3, the Okafors' bank now charges 8% instead of 4%, so the monthly payment on the same $20,000 loan rises from $451.58 to $488.26, more than their $470 budget. They will probably borrow less, choose a cheaper car or wait. Rubric: 1 point for a detail from each source (2 points); 1 point for the effect on borrowing.
Question 17 of 20 · Short Answer
Explain how the change in interest rates affects Lena's decision to invest in a truck. What would she probably decide if the rate fell back to 5%?
Model answer: The truck adds $2,520 a year. At 9%, the interest ($3,240) is more than that, so the investment loses money and she will probably not buy the truck now. At 5%, the interest would be $1,800, less than $2,520, so the truck would pay for itself and she would probably buy it. This is how higher rates reduce business investment and lower rates increase it. Rubric: 1 point for the decision at 9% with numbers; 1 point for the decision at 5%; 1 point for the general idea.
Question 18 of 20 · Short Answer
In Source 3, who is better off because of the higher interest rates, and who is worse off? Explain using at least two of the three residents.
Model answer: Mr. Diaz, a saver, is better off: his $5,000 now earns $225 a year instead of $25. The Okafor family and Lena, who need to borrow, are worse off: the Okafors' payment rises above their budget, and Lena's truck no longer pays for itself. Higher rates help lenders and savers and cost borrowers more. Rubric: 1 point for a resident who gains, with a reason; 1 point for a resident who loses, with a reason.
Question 19 of 20 · Short Answer
Using Source 2, describe what happened to car-loan rates and to the growth of nonrevolving consumer credit from 2021 to 2025. Then give one reason to be careful about the conclusion you draw.
Model answer: The car-loan rate rose from 4.82% in 2021 to a high of 8.16% in 2024, then eased to 7.65% in 2025. Growth in nonrevolving credit, mostly car and student loans, fell from 5.4% in 2021 and 2022 to 0.6% in 2023, then picked up a little to 1.8% in 2025. This fits the idea that higher rates slow borrowing. But many other things changed in those years, such as prices and incomes, so the table alone does not prove that rates were the cause. Rubric: 1 point for the rate trend; 1 point for the borrowing trend; 1 point for a fair caution.
Question 20 of 20 · Short Answer
Write the chain of effects from Source 1 for a fall in interest rates, starting with the Fed and ending with jobs. Include both borrowing and business investing.
Model answer: The Fed lowers the federal funds rate, other interest rates fall, and borrowing becomes cheaper. Households are more willing to borrow and buy goods and services, and businesses borrow to buy property and equipment to expand, which is investing. This greater spending raises demand for what businesses produce, so they hire more workers. Rubric: 1 point for the start of the chain (Fed rate to other rates); 1 point for both borrowing and investing; 1 point for the link to jobs.
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Frequently Asked Questions
10 Questions
What does D2.Eco.10.6-8 mean?
D2.Eco.10.6-8 asks middle school students to explain how changes in interest rates affect borrowing and investing. The full text is "Explain the influence of changes in interest rates on borrowing and investing." It belongs to The National Economy part of the C3 Framework's economics indicators for grades 6-8.
What does "investing" mean in D2.Eco.10.6-8?
In economics, investing usually means businesses spending on capital goods: machines, vehicles, buildings and software used to produce more later. Many people also use "investing" for buying stocks or putting money in savings. This lesson focuses on business investment and shows the saver's side too, so students see both meanings.
Why do higher interest rates mean less borrowing?
Because the interest rate is the price of borrowing. When the price goes up, a loan costs more each month and in total, so some families wait, borrow less or choose cheaper items, and some business projects no longer earn enough to cover the interest. Some borrowers still borrow, especially when they truly need a car or a loan for school.
Does the Federal Reserve set the interest rate on my car loan?
No. The Fed sets a target for the federal funds rate, a short-term rate for loans between banks. Banks and other lenders set the rates on car loans, credit cards and mortgages, which tend to move in the same direction as the Fed's rate but not by the same amount or at the same time. Source 2 shows this pattern from 2021 to 2025.
Who benefits when interest rates rise?
Savers and lenders usually benefit, because they receive more interest. Borrowers pay more. The same person can be on both sides: a family may earn more on its savings account while paying more on its car loan.
Is the data in this lesson real?
Source 2 is real data from the Federal Reserve Board: average bank rates on 60-month new-car loans and on credit cards, growth in consumer borrowing, and the Fed's target range at the end of each year from 2021 to 2025. Source 3 and the worked examples are invented and labeled as invented.
How much math does D2.Eco.10.6-8 need?
Only percents. Students find simple interest for one year (rate times amount) and compare a project's yearly return with the interest rate. Monthly car payments are given from a loan calculator; students compare them but do not need the payment formula.
Should students say whether the Fed made the right decision?
Not for this indicator. D2.Eco.10.6-8 asks students to explain the effects of a change in rates, not to judge a particular decision. People disagree about when rates should rise or fall, and the lesson leaves recent decisions out on purpose.
How can families practice D2.Eco.10.6-8 at home?
Look at an advertised loan or savings rate together and ask: how much would $1,000 cost or earn in a year at this rate? What would change if the rate were 3 points higher? Who would borrow less, and who would save more?
What comes after D2.Eco.10.6-8?
In high school, D2.Eco.10.9-12 asks students to use current data to explain how changes in spending, production and the money supply affect economic conditions. D2.Eco.11.6-8, at the same grade band, asks students to use data on employment, inflation and production.
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Related Standards
5 standards
These standards connect to D2.Eco.10.6-8: prerequisites to review first, parallel standards at the same level, and next steps that build on it.
Before this lesson
D2.Eco.3.6-8Prerequisite
Explain the roles of buyers and sellers in product, labor and financial markets
Use current data to explain how spending, production and money supply affect the economy
Lesson coming soon
Standard text: National Council for the Social Studies (NCSS), The College, Career, and Civic Life (C3) Framework for Social Studies State Standards: Guidance for Enhancing the Rigor of K-12 Civics, Economics, Geography, and History (Silver Spring, MD: NCSS, 2013). NCSS was not involved in the production of this lesson and does not endorse it.
