Module 23

The Basics Of Banking

This module demystifies the world of banking and its crucial role in both personal finance and the broader economy. We start by exploring the fundamental question, "What is a bank?" laying a solid foundation before journeying through history to uncover how banks originated.

We then delve into the mechanics of how banks operate and generate revenue, before analyzing the benefits banks play in an individual’s financial lives.

Module At A Glance

Grade Levels:

6th - 12th

Est. Length:

2-3 Hours (21 slides)

Activities:

4 Activities

Articles:

5 Articles

Languages:

English & Spanish

Curriculum Fit:

Math, Business, Economics, CTE, Social Studies

Standards Alignment:

CEE National Standards, Jump$tart National Standards & Relevant State Standards

Guiding Questions

What is a bank?
How did banks get started?
How do banks operate and make money?
What value do banks have to you?
What is FDIC insurance?
Why banks are important to you and to the economy?
What is the future of banking?

Enduring Understandings

Banks play an integral role in the global economy by fueling financial growth beyond the financial industry.
The differences between a commercial bank and an investment bank, and how they both make money.
How the government protects your money in banks to not create another Great Depression or Financial Crisis.
What is important when choosing a bank and what should individual's try to avoid.

Module Vocab & Key Topics

Bank: A financial institution licensed to receive deposits and make loans.
Commercial/Retail Bank: A bank that offers services to the general public and to companies.
Investment Bank: A bank that specializes in services for businesses and investors, like underwriting deals for large companies and advising on mergers and acquisitions.
Deposit: Money placed in any type of bank account.
Interest: The charge for the privilege of borrowing money, typically expressed as an annual percentage rate.
FDIC Insurance (Federal Deposit Insurance Corporation): A United States government corporation providing deposit insurance up to $250,000 to depositors in U.S. banks.
Bank Services: Various offerings provided by banks to their customers, like checking accounts, savings accounts, mortgages, and loans.
Checking Account: A deposit account at a bank that allows withdrawals and deposits, often accessible via checks, ATMs, and electronic debits.
Savings Account: A deposit account that earns interest and is typically used for saving money over a period of time with a minimum account balance that you must maintain.
High-Yield Savings Account: A type of savings account that offers a higher interest rate compared to standard savings accounts.
CD (Certificate of Deposit): A savings certificate with a fixed maturity date and specified fixed interest rate over that period.
Overdraft Protection: A service that prevents checks, ATM transactions, or debit card purchases from overdrawing a bank account, which can create unexpected fees.
Wire Transfer Fees: Charges applied for electronic transfer of funds from one person or entity to another.
Transaction Fees: Fees charged for certain types of transactions, such as transferring money or making payments.

Worked Examples

Banking In Action

Four ways a bank account quietly adds to — or subtracts from — your money.

Figures current · August 2026

APY vs APR

Why Compounding Frequency Matters

APY = (1 + r/n)ⁿ − 1n = times per year

Put the same 5% nominal rate (the APR) on a savings account and add the interest at different frequencies. Compounding once a year leaves it at 5.00% APY; compounding every day nudges it to 5.13%. The exponent n — how many times a year interest is added — is all that changes.

5.127%APY at daily compoundingAPR: 5.000%

The same nominal rate earns a little more the more often it compounds — moving from annual to daily lifts a 5% APR only to about 5.13% APY.

Overdraft

A $35 Fee on a $5 Coffee

effective cost = fee ÷ purchasefee = $35

Large banks typically charge about $35 when a debit purchase overdraws an account, even though most overdrafts are on purchases under $26 (CFPB). Dividing that flat fee by the purchase turns it into an effective cost — and the smaller the purchase, the larger that share.

700%effective cost on a $5 coffee$100 purchase: 35%

A flat overdraft fee's effective cost climbs as the purchase shrinks — the same $35 is 700% of a $5 coffee but only 35% of a $100 purchase.

Checking vs HYSA

Idle Money Left on the Table

forgone = balance × (r_hysa − r_check)per year

The FDIC national average interest-checking account pays just 0.07% APY, while a competitive high-yield savings account pays about 4.20%. On a $10,000 balance that gap is the interest the checking account never earns — the same dollars, two very different yields.

$413forgone each year on $10,000checking earns just $7

Forgone interest is the balance times the rate gap, so at 0.07% versus 4.20% a $10,000 checking balance leaves about $413 a year unearned.

FDIC

How Much Is Insured

insured = min(balance, $250,000)per depositor, per bank

FDIC insurance covers deposits up to $250,000 per depositor, per insured bank, per ownership category — a limit unchanged since 2008. Balances at or below it are fully protected; on a $1,000,000 balance only the first $250,000 is insured, so "min" picks the smaller of the two.

$250,000insured per depositor, per bank$1M balance → $250k covered

Insurance covers the smaller of the balance and the $250,000 limit, so every dollar up to the cap is protected and dollars above it are not.

Sources: overdraft fee — $35 typical of large banks (CFPB), $26.77 national average (Bankrate 2025 checking survey); interest-checking 0.07% APY and the $250,000 FDIC insurance limit (FDIC); high-yield savings ~4.20% APY (NerdWallet, Aug 2026). Checked August 24, 2026. APY figures derived at a 5% nominal rate.

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Financial Probabilities

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Reading Financial Charts