---
title: "Trade Diversion | Principles of Macroeconomics"
description: "Trade diversion happens when a trade agreement shifts imports from a lower-cost outside producer to a higher-cost partner, raising prices in Principles of Macroeconomics."
canonical: "https://fiveable.me/principles-macroeconomics/key-terms/trade-diversion"
type: "key-term"
subject: "Principles of Macroeconomics"
unit: "Unit 21"
---

# Trade Diversion | Principles of Macroeconomics

## Definition

Trade diversion is when a country starts buying from a less efficient trade partner because a tariff cut or regional agreement makes that partner cheaper than an outside producer. In Principles of Macroeconomics, it shows up in trade policy and regional trade agreements.

## What It Is

Trade diversion is a macroeconomics term for a trade shift that happens after a country joins a customs union or regional trade agreement. Instead of importing from the world’s lowest-cost producer, the country imports from a partner inside the agreement because outside goods now face a tariff or other barrier.

The basic idea is simple: a policy changes the relative price of imports. If a foreign producer outside the agreement used to sell the good more cheaply than the member-country producer, the country would normally buy from the outside producer. But once a tariff is placed on outside imports, the outside good can become more expensive than the partner good, even if the partner is not the most efficient producer overall.

That is why trade diversion is not the same thing as trade creation. Trade creation happens when barriers fall and consumers switch from a higher-cost domestic good to a lower-cost imported good. Trade diversion happens when the country switches from a lower-cost outsider to a higher-cost insider because of the policy structure of the agreement.

Here is a quick example. Suppose Country A can buy widgets from Country X for $8 each and from Country B, its new regional partner, for $9 each. If a tariff on Country X raises the price to $10, Country A may import from Country B instead. The trade agreement made the switch possible, but the switch moved trade away from the cheaper producer.

Macroeconomics focuses on the bigger picture, so trade diversion is usually discussed as a welfare issue. It can lower total efficiency because resources are no longer going to the lowest-cost supplier. That is why economists often ask whether a regional trade agreement creates more trade than it diverts, and whether the benefits of lower barriers inside the bloc outweigh the cost of buying from a less efficient source.

## Why It Matters

Trade diversion matters because it shows that not every trade agreement automatically makes an economy better off. A country can lower some barriers and still end up buying more expensive imports if the agreement favors partner countries over cheaper outside producers.

That makes the term useful when you are comparing regional trade agreements, customs unions, and the general goal of reducing trade barriers. It explains why economists do not judge a trade deal only by whether tariffs fall. They also ask where imports are coming from, how much prices change, and whether consumers are actually getting access to the cheapest goods available.

It also helps you read policy questions more carefully. If a tariff is cut only for member countries, the immediate winner may be a less efficient partner industry, while domestic consumers pay more than they would have paid under open global competition. That is the core macro trade-off behind trade diversion.

In class, this term often shows up in discussions of regional trading agreements and welfare analysis. If you can spot trade diversion, you can explain why a policy can look pro-trade on the surface but still reduce overall efficiency.

## Connections

### Trade Creation

Trade creation is the closest comparison because both terms describe how a trade agreement changes import patterns. The difference is that trade creation moves buying from a higher-cost domestic producer to a lower-cost foreign one, while trade diversion moves buying from a lower-cost outside producer to a higher-cost partner. If you mix them up, you will miss the welfare effect.

### Customs Union

Trade diversion often appears in a customs union, where member countries share a common external tariff. That tariff can make outside suppliers more expensive and push imports toward partner countries. In macro problems, the customs union is usually the policy setup that creates the diversion in the first place.

### [Regional Trading Agreements](/principles-macroeconomics/key-terms/regional-trading-agreements)

Regional trading agreements can lower trade barriers inside the group, but they can also redirect trade away from efficient nonmembers. Trade diversion is one reason economists evaluate these agreements carefully instead of assuming they always increase welfare. It shows the difference between freer trade inside a region and freer trade with the whole world.

### Trade Barriers

Tariffs, quotas, and other trade barriers change relative prices, which is what makes trade diversion possible. The key move is not just that barriers exist, but that they change which supplier looks cheapest after policy is applied. If you understand trade barriers, trade diversion becomes easier to trace in graphs or scenarios.

## On the AP Exam

Quiz questions and free-response style prompts usually ask you to identify whether a policy causes trade creation or trade diversion. You may get a short scenario, a graph, or a comparison of import prices and need to explain which supplier a country switches to after a tariff or regional deal.

A strong answer does three things: names the cheaper outside producer, shows how the policy changes the relative price, and states why the new partner is not the lowest-cost option. If the question asks about welfare, mention that consumers may face higher prices and the economy may move away from efficient allocation.

In a graph or table, look for imports shifting from a nonmember country to a member country after an external tariff is applied. That pattern is the giveaway for trade diversion.

## Trade Diversion vs Trade Creation

Trade diversion and trade creation both happen when trade policy changes who a country buys from, but they point in opposite directions. Trade creation is when barriers fall and imports shift to a lower-cost source, which usually raises efficiency. Trade diversion is when a policy pushes imports toward a higher-cost partner and away from a cheaper outsider, which can reduce welfare.

## Key Takeaways

- Trade diversion happens when a country switches imports from a cheaper outside producer to a more expensive partner because of a tariff or trade agreement.
- The term usually comes up with customs unions and regional trading agreements, where external trade barriers can change which supplier looks cheapest.
- Trade diversion can reduce economic welfare because the country is no longer buying from the lowest-cost source.
- Do not confuse trade diversion with trade creation, which is the move from a higher-cost domestic producer to a lower-cost foreign one.
- When you see a policy scenario, check whether the price change is redirecting trade or actually making imports cheaper overall.

## FAQs

### What is trade diversion in Principles of Macroeconomics?

Trade diversion is when a country starts importing from a less efficient trade partner because a tariff or regional trade agreement makes that partner look cheaper than an outside producer. The switch happens because policy changes relative prices, not because the partner is the world’s lowest-cost supplier. In macroeconomics, that can lower overall welfare.

### How is trade diversion different from trade creation?

Trade creation moves buying from a higher-cost domestic source to a lower-cost foreign source, which usually increases efficiency. Trade diversion moves buying from a lower-cost outside producer to a higher-cost partner inside the agreement. The first tends to raise welfare, while the second can reduce it.

### Why can a free trade agreement cause trade diversion?

A free trade agreement can lower tariffs on member countries while keeping barriers against nonmembers. That means a partner country may become cheaper than an outside country even if the outside country is more efficient overall. The result is that imports shift toward the partner, which is the diversion effect.

### What does trade diversion look like on a macroeconomics test question?

You usually see a short scenario where a country stops importing from the cheapest world supplier and starts buying from a member country after a tariff or agreement changes prices. The answer should explain the price shift and the loss of efficiency. If the policy makes imports come from a higher-cost source, that is trade diversion.

## Related Study Guides

- [21.4 How Governments Enact Trade Policy: Globally, Regionally, and Nationally](/principles-macroeconomics/unit-21/4-governments-enact-trade-policy-globally-regionally-nationally/study-guide/M2ZNxIaAIYPjeRwu)
- [20.4 The Benefits of Reducing Barriers to International Trade](/principles-macroeconomics/unit-20/4-benefits-reducing-barriers-international-trade/study-guide/kXpWTge7gi4LUto1)

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