---
title: "Demand for Reserves — AP Macro Definition & Exam Guide"
description: "Demand for reserves is the downward-sloping curve showing how many reserve balances banks want at each interest rate. It's the heart of the AP Macro reserve market model in Topic 4.6."
canonical: "https://fiveable.me/ap-macro/key-terms/demand-for-reserves"
type: "key-term"
subject: "AP Macroeconomics"
unit: "Unit 4"
---

# Demand for Reserves — AP Macro Definition & Exam Guide

## Definition

Demand for reserves is the quantity of reserve balances banks want to hold at each interest rate, drawn as a downward-sloping curve in the reserve market. When the interest rate is high, holding reserves means giving up profitable lending, so banks want fewer; when it's low, banks happily hold more.

## What It Is

Demand for reserves is one half of the [reserve market model](/ap-macro/unit-4/monetary-policy/study-guide/gKjFf4lqzvav9TCjFNoh "fv-autolink") you use in Topic 4.6 (Monetary Policy). It shows the quantity of reserve balances banks want to hold at every possible [interest rate](/ap-macro/key-terms/interest-rate "fv-autolink"), and it slopes downward. Here's the intuition. Reserves are the money banks park at the central bank instead of lending out. The interest rate (specifically, the policy rate banks could earn by lending those funds) is the opportunity cost of sitting on reserves. When that rate is high, lending looks great and holding reserves looks expensive, so banks demand fewer reserves. When the rate is low, there's not much to give up, so banks are fine holding lots of them.

One more piece matters for the AP graph. In the U.S. ample-reserves system described in EK POL-1.D.2, the [demand curve](/ap-macro/key-terms/demand-curve "fv-autolink") doesn't slope down forever. It flattens out and becomes horizontal at the interest rate the central bank pays on reserves. Why? No bank will lend reserves to another bank for less than it can earn risk-free just by leaving them at the central bank. That flat section is exactly where the Fed wants the market to sit, because there it can move the policy rate by changing administered rates instead of changing the quantity of reserves.

## Why It Matters

This term lives in [Unit 4](/ap-macro/unit-4 "fv-autolink") (Financial Sector), Topic 4.6, and supports learning objective 4.6.A, which asks you to define monetary policy and related terms. The CED is explicit that monetary policy works differently in limited-reserves versus ample-reserves banking systems, and the U.S. has ample [reserves](/ap-macro/key-terms/reserves "fv-autolink"). That means the reserve market graph, with its downward-sloping demand curve flattening at interest on reserves, is the graph the exam expects for U.S. monetary policy. If you can't draw and read the demand for reserves curve, you can't show how the Fed changes interest rates, and that's the whole mechanism connecting monetary policy to aggregate demand.

## Connections

### [Ample reserves framework (Unit 4)](/ap-macro/key-terms/ample-reserves-framework)

The shape of the demand curve is the reason the ample-reserves framework exists. Because supply intersects demand on its flat section, the Fed steers the [policy rate](/ap-macro/key-terms/policy-rate "fv-autolink") by adjusting administered rates rather than by shifting the supply of reserves. The demand curve tells you why that works.

### [Interest on reserves (Unit 4)](/ap-macro/key-terms/interest-on-reserves)

[Interest on reserves](/ap-macro/key-terms/interest-on-reserves "fv-autolink") sets the floor where the demand curve goes horizontal. Banks won't lend reserves below the rate they can earn risk-free at the central bank, so raising or lowering interest on reserves drags the flat part of the curve, and the policy rate, up or down with it.

### [Money Supply (Unit 4)](/ap-macro/key-terms/money-supply)

In the older limited-reserves story, the Fed changed interest rates by shifting [money supply](/ap-macro/key-terms/money-supply "fv-autolink") against money demand. Demand for reserves plays the same role money demand played in that model, just for the market where banks borrow and lend reserves overnight.

### [Investment Spending (Units 3-4)](/ap-macro/key-terms/investment-spending)

This curve is step one in the monetary policy chain. The reserve market sets the policy rate, the policy rate influences other interest rates, and those rates move investment spending and aggregate demand. That chain is exactly what FRQs ask you to trace.

## On the AP Exam

Expect the reserve market graph on both multiple choice and FRQs. You'll need to draw the demand for reserves curve correctly, downward sloping with a horizontal section at the interest on reserves rate, and show how a change in an administered rate moves the equilibrium policy rate. MCQ stems often test the logic behind the slope, asking why banks hold fewer reserves at higher rates (opportunity cost of forgone lending) or why the curve flattens (no bank lends below what interest on reserves pays). No released FRQ has used the phrase "demand for reserves" verbatim, but the reserve market model is the CED's required framework for U.S. monetary policy under EK POL-1.D.2, so graph questions on expansionary or contractionary policy run straight through this curve.

## Demand for reserves vs Money demand

Both are downward-sloping curves against an interest rate, but they live in different markets. Money demand is households and firms deciding how much cash to hold versus interest-earning assets, and it pairs with a vertical money supply curve in the money market. Demand for reserves is banks deciding how many reserve balances to hold at the central bank, and it pairs with reserve supply in the reserve market. In the U.S. ample-reserves system, the reserve market graph is the one the AP exam expects for monetary policy.

## Key Takeaways

- Demand for reserves shows the quantity of reserve balances banks want to hold at each interest rate, and it slopes downward because higher rates raise the opportunity cost of holding reserves instead of lending.
- The curve becomes horizontal at the interest on reserves rate, because no bank will lend reserves for less than it can earn risk-free by parking them at the central bank.
- In the U.S. ample-reserves system, equilibrium sits on the flat part of the demand curve, so the Fed moves the policy rate by changing administered rates like interest on reserves, not by shifting the quantity of reserves.
- This is the AP-required graph for U.S. monetary policy under Topic 4.6, so you need to draw it, label it, and show rate changes on it for FRQs.
- Don't confuse it with money demand; money demand is people holding cash in the money market, while demand for reserves is banks holding balances in the reserve market.

## FAQs

### What is the demand for reserves in AP Macro?

It's the quantity of reserve balances that banks want to hold at different interest rates, shown as a downward-sloping curve in the reserve market in Topic 4.6. Higher interest rates mean a higher opportunity cost of holding reserves, so banks demand fewer.

### Why does the demand for reserves curve flatten out?

It goes horizontal at the interest on reserves rate, an administered rate set by the central bank. No bank will lend reserves to another bank below that rate, since it can earn it risk-free just by leaving the money at the central bank.

### Is demand for reserves the same as money demand?

No. Money demand is households and firms choosing how much cash to hold, graphed in the money market. Demand for reserves is banks choosing how many reserve balances to hold, graphed in the reserve market, which is the model the AP exam uses for the U.S. ample-reserves system.

### Does the Fed shift the demand for reserves curve to change interest rates?

Not exactly. In the ample-reserves framework, the Fed changes administered rates like interest on reserves, which moves the flat portion of the demand curve and the equilibrium policy rate with it. The Fed doesn't need to shift reserve supply to move rates when reserves are ample.

### Why is the demand for reserves downward sloping?

Because the interest rate is the opportunity cost of holding reserves. At high rates, banks give up a lot of lending profit by sitting on reserves, so they hold fewer; at low rates, the cost of holding reserves is small, so they hold more.

## Related Study Guides

- [4.6 Monetary Policy](/ap-macro/unit-4/monetary-policy/study-guide/gKjFf4lqzvav9TCjFNoh)

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