## Learning Outcomes

- Define **money supply** and explain why economists use more than one measure of it
- Identify what counts in **M1** and what counts in **M2**
- Explain why **liquidity** is the main difference between M1 and M2
- Classify common assets as M1, M2 but not M1, or neither
- Avoid common exam mistakes involving savings deposits, currency in circulation, and non-money assets
- Interpret how M1 and M2 connect to money demand, spending, and AP Macroeconomics questions

## AP Macroeconomics Syllabus

For the AP Macroeconomics, you are expected to understand money supply measures, with a focus on the following syllabus points:

- Know that **M1** is the narrow, most liquid measure of money used for transactions
- Identify the main components of **M1**, including currency in circulation and checkable deposits
- Know that **M2** includes everything in M1 plus less liquid **near-money** assets
- Explain the difference between **demand deposits**, **other checkable deposits**, **savings deposits**, and **small time deposits**
- Understand that **liquidity** means how quickly an asset can be used for spending without losing value
- Distinguish money from non-money financial assets such as stocks, bonds, and credit cards
- Recognise that **currency in circulation** does not include vault cash held by banks
- Understand the AP-safe distinction between traditional textbook definitions and the Federal Reserve’s post-2020 reporting change

## Test Your Knowledge

_Attempt these questions before reading this article. If you find some difficult or cannot remember the answers, look more closely at that area during your revision._

1. What is the difference between **M1** and **M2**?
2. Why are savings deposits usually treated as less liquid than checkable deposits?
3. Does currency held in a bank vault count as currency in circulation?
4. Would a stock or credit card be included in M1 or M2?
5. Why is **M2** always at least as large as **M1**?

## Introduction

Money seems simple in daily life: you pay with cash, a debit card, or money in a bank account. In economics, though, the word **money** needs more precision. The AP Macroeconomics exam expects you to know that economists measure the money supply using categories such as **M1** and **M2**, because not all assets are equally easy to spend.

This matters because macroeconomic analysis often links the money supply to interest rates, aggregate demand, inflation, and the banking system. If you cannot tell which assets belong in M1 or M2, you will struggle with money market questions and with policy questions later in the course.

> **Key Term: money supply**
> The total quantity of money available in an economy, measured using categories such as M1 and M2.

### What M1 and M2 measure

Economists define money broadly as anything generally accepted as payment for goods and services. That definition includes obvious forms like cash, but also certain bank deposits because people use them directly to buy things.

> **Key Term: M1**
> A narrow measure of the money supply made up of the most liquid forms of money, mainly currency in circulation and checkable deposits.
>
> **Key Term: M2**
> A broader measure of the money supply that includes all of M1 plus less liquid near-money assets such as savings deposits and small time deposits in standard AP definitions.

The key idea is **liquidity**.

> **Key Term: liquidity**
> The ease and speed with which an asset can be used for transactions or converted into cash without losing value.

M1 contains assets that can be used almost immediately for purchases. Think of cash in your wallet or money in a checking account. M2 includes these same assets, but adds assets that are still fairly easy to turn into spending power, just not quite as direct.

A useful AP-safe summary is:

- **M1 = currency in circulation + checkable deposits**
- **M2 = M1 + near moneys**

Why have two measures? Because economists want one measure that captures money used directly in transactions, and another that includes assets that are close substitutes for transaction money. If households shift money from checking into savings, their immediate spending ability changes a bit, but their wealth is still highly liquid. M2 captures that broader picture.

> **Test Tip:** On the AP exam, if a question asks for the _most liquid_ money, think **M1**. If it asks for a _broader_ measure that includes savings-type assets, think **M2**.

### The components of M1

M1 is the most exam-tested measure because it focuses on money used directly in transactions.

The main parts are:

- **Currency in circulation**
- **Demand deposits**
- **Other checkable deposits**
  > **Key Term: currency in circulation**
  > Paper money and coins held by the public, not cash sitting inside bank vaults.

This last point causes many mistakes. If you deposit cash into your bank account, that cash is no longer counted as currency in circulation. Why not? Because if economists counted both the deposited cash and the deposit balance, they would count the same money twice.

Suppose you deposit $100 in cash into checking:

- Currency held by the public falls by $100
- Checkable deposits rise by $100

So M1 does not necessarily change. The form of money changes, but the total does not.

> **Key Term: demand deposits**
> Checking-account balances at commercial banks that can be withdrawn on demand and used for payments.
>
> **Key Term: other checkable deposits**
> Checkable accounts at other depository institutions, such as some credit unions or savings institutions, that can also be used for payments.

These deposits belong in M1 because they are directly spendable. You can write a check, use a debit card, or make an electronic payment from them. That direct spending ability is why they are grouped with currency.

Students often think physical cash must be the biggest part of the money supply because it feels like “real money.” In fact, it is often much smaller than checkable and other liquid deposits. Most money in a modern economy exists as account balances, not paper bills.

A simple classification table helps:

| Asset                            | M1? | Why?                        |
| -------------------------------- | --- | --------------------------- |
| Dollar bills in your wallet      | Yes | Directly spendable          |
| Coins in your pocket             | Yes | Directly spendable          |
| Checking account balance         | Yes | Directly spendable          |
| Credit union share draft account | Yes | Checkable deposit           |
| Cash in a bank vault             | No  | Not currency in circulation |

The logic is always the same: can the public use it directly to buy goods and services right now?

### The components of M2 and why it is broader

M2 includes everything in M1 plus assets that are highly liquid but not usually used directly at the checkout counter.

> **Key Term: near money**
> Financial assets that are not as directly spendable as cash or checking deposits but can be converted into spendable money fairly easily.

In standard AP and textbook language, M2 adds:

- **Savings deposits**
- **Small-denomination time deposits**
- **Retail money market mutual funds**
  > **Key Term: savings deposits**
  > Money held in savings accounts that is highly liquid but not usually used directly for transactions in the same way as checking deposits.
  >
  > **Key Term: small-denomination time deposits**
  > Deposits with a fixed maturity date that are less liquid than savings or checking accounts.
  >
  > **Key Term: retail money market mutual funds**
  > Retail fund balances that are very liquid but not as directly spendable as M1 assets.

Why are these not always placed in M1 in AP-style definitions? Because you normally cannot use them as directly as checking money. A savings account can usually be moved into checking very easily, but that extra step matters. A small time deposit may require waiting until maturity or paying a penalty. That makes it liquid, but less liquid.

This gives a clear hierarchy:

- **Most liquid**: cash and checkable deposits → **M1**
- **Highly liquid but less direct**: savings and similar assets → added in **M2**

That is why **M2 is always at least as large as M1**. M1 is a subset of M2.

A second classification table is worth memorising:

| Asset                           | Classification        |
| ------------------------------- | --------------------- |
| Currency held by the public     | M1 and M2             |
| Checking account                | M1 and M2             |
| Savings account                 | M2 in standard AP use |
| Small CD / small time deposit   | M2 but not M1         |
| Retail money market mutual fund | M2 but not M1         |
| Stock                           | Neither               |
| Bond                            | Neither               |
| Real estate                     | Neither               |
| Credit card                     | Neither               |

The last row is especially important. A **credit card is not money**. It is a way to borrow money. Students confuse payment method with money supply. Using a credit card lets you spend, but the card itself is not part of M1 or M2.

> **Test Tip:** If an asset represents borrowing power or wealth but is not itself a liquid money balance, it is probably **neither** M1 nor M2.

### How to reason through classification questions

Many AP questions do not ask for a definition. They ask you to sort an item into the correct category. To do that well, ask three questions.

#### Is it directly spendable?

If yes, it is likely in **M1**. Cash and checking deposits fit here.

#### If not directly spendable, is it still highly liquid?

If yes, it is likely in **M2 but not M1** in standard AP treatment. Savings accounts and small time deposits fit here.

#### Is it just wealth or a financial claim?

If yes, it is probably **neither**. Stocks and bonds may be valuable, but you cannot usually use them immediately to buy groceries without selling them first, and their value can change.

Work through a few examples:

1. **A $500 checking account balance**
   - Directly spendable
   - Therefore: **M1**

2. **A $2,000 savings account**
   - Not usually spent from directly in standard textbook framing
   - But easy to move into checking
   - Therefore: **M2 but not M1** in standard AP framing

3. **A $10,000 Treasury bond**
   - Valuable asset, but not money
   - Must be sold before spending proceeds
   - Therefore: **Neither**

4. **$200 in cash deposited into a bank vault**
   - No longer held by the public
   - Therefore: not part of currency in circulation
   - Its value is reflected through deposits instead

This is why the distinction is about function, not just value. A valuable thing is not automatically money.

### The 2020 definition issue and how to handle it on the exam

This topic has one complication that can confuse strong students: the Federal Reserve changed its published statistical treatment in **May 2020**.

Traditionally, AP courses and many textbooks teach:

- **M1 = currency + checkable deposits**
- **M2 = M1 + savings deposits + small time deposits + retail money market funds**

After the reporting change, savings deposits were folded into published M1 measures by the Fed, making measured M1 jump sharply.

Why does this matter? If you look at real-world data across 2020, M1 appears to surge partly because of a definition change, not just because households suddenly held vastly more transaction money.

For AP purposes, the safest rule is:

- Use your course or textbook definition unless the question explicitly says to use the current Federal Reserve definition.
- In most classroom and AP-style review settings, **savings deposits are treated as part of M2 rather than M1**.

You do not need to panic about competing definitions. The exam reward comes from using the definition the question is built around and showing that you understand the role of liquidity.

This is also why some texts now use phrases such as **other liquid deposits** in M1. That reflects the newer reporting style. But the central economics idea has not changed: economists still separate more directly spendable money from broader, less liquid money.

## Key Point Checklist

_This article has covered the following key knowledge points:_

- The money supply is the total quantity of money in the economy
- M1 is the narrowest common measure and contains the most liquid money
- M1 includes currency in circulation and checkable deposits
- Demand deposits and other checkable deposits are both part of checkable deposits
- Currency in circulation does not include cash held in bank vaults
- M2 includes all of M1 plus less liquid near-money assets
- In standard AP use, savings deposits, small time deposits, and retail money market mutual funds are part of M2
- Liquidity means how quickly an asset can be used for transactions without losing value
- M2 is always at least as large as M1 because M1 is included inside M2
- Stocks, bonds, real estate, and credit cards are not part of standard M1 or M2
- Classification questions should be answered by focusing on direct spendability and liquidity
- The Fed’s post-2020 reporting change moved savings deposits into published M1, but AP questions often still use the traditional textbook distinction

## Key Terms and Concepts

- money supply
- M1
- M2
- liquidity
- currency in circulation
- demand deposits
- other checkable deposits
- near money
- savings deposits
- small-denomination time deposits
- retail money market mutual funds


Definition, Measurement, and Functions of Money - Money supply uses M1 M2