# International Trade

Business I · Introduction to Economics · https://tryals.app/learn/business-i/international-trade

## Why Nations Trade

Trade's deepest result is counterintuitive: nations gain from trade **even if one is worse at everything**.

**Absolute advantage** means producing more with the same resources. **Comparative advantage** means producing at the lowest opportunity cost in forgone alternatives.

Ana drafts contracts and types faster than her assistant, yet she hands off typing. Her hour typing costs a 300 euro contract; her assistant's hour costs little. Nations obey this same arithmetic.

| | Absolute Advantage | Comparative Advantage |
| --- | --- | --- |
| **Definition** | Produce more with same resources | Produce at lower opportunity cost |
| **Decides trade?** | No | **Yes** |
| **All goods?** | One side can hold both | Impossible, costs are relative |

> **Key rule:** Specialize where your opportunity cost is lowest. Both sides then consume beyond their production frontiers: **gains from trade**.

## Barriers and Balances

**Barriers.** A **tariff** taxes imports. Domestic producers and the treasury gain, consumers pay more, and part of the loss evaporates as **deadweight loss**. A **quota** caps quantities, and **non-tariff barriers** use standards and licensing.

> **Common pitfall:** Judging a tariff only by visible winners. Losses and deadweight loss spread thinly across consumers and exceed gains.

**Trade balance**, exports minus imports, reflects national saving and investment, not winning or losing. A deficit means foreigners finance domestic investment.

| | Tariff | Quota |
| --- | --- | --- |
| **Mechanism** | Tax on imports | Quantity cap on imports |
| **Treasury effect** | Generates revenue | No direct revenue |

Protection persists because benefits concentrate on an organized few while costs spread across all consumers.

## Practice questions

7 of this lesson's 13 practice questions, with answers. The full set is in the app.

### 1. Which statements about a trade deficit are correct?

A. Imports exceed exports
B. It means foreigners are net financing the domestic economy
C. It proves the country is losing at trade
D. It reflects the gap between national saving and investment

**Answer:** A. Imports exceed exports; B. It means foreigners are net financing the domestic economy; D. It reflects the gap between national saving and investment

**Why:** A deficit is an accounting mirror of capital inflows, not a scoreboard. Whether it is healthy depends on whether the inflow funds factories or consumption.

Page: https://tryals.app/practice/business-i/international-trade/which-statements-about-a-trade-deficit-are-correct

### 2. A country worse at producing everything than its partner still gains from trade. What makes that possible?

A. Because the more productive country charges below cost to win market share
B. Because trade is only mutually beneficial when productivity levels are equal
C. Because gains rest on comparative and not absolute advantage
D. Because tariffs redistribute the gains toward the weaker country

**Answer:** C. Because gains rest on comparative and not absolute advantage

**Why:** Opportunity costs, not productivity levels, drive specialisation. Ricardo’s point is precisely that being worse at everything is compatible with being relatively better at something.

Page: https://tryals.app/practice/business-i/international-trade/a-country-worse-at-producing-everything-than-its-partner-still-gains

### 3. Order the chain from specialization to shared gains.

**Answer:**

1. Each country computes its opportunity costs
2. Each specializes where that cost is lowest
3. World output of both goods rises
4. Countries exchange at an agreed ratio
5. Both consume beyond their own frontiers

**Why:** Compare costs, specialize, produce more together, swap, and both sides end up outside their own PPFs, the whole argument in five steps.

Page: https://tryals.app/practice/business-i/international-trade/order-the-chain-from-specialization-to-shared-gains

### 4. Sort each trade barrier by its type.

**Answer:**

- Tariff: A 25% tax on imported steel, A per-liter duty on imported wine
- Quota: A cap of 50,000 imported cars per year
- Non-tariff barrier: A certification maze only local firms can navigate

**Why:** Tariffs work through price, quotas through quantity, and non-tariff barriers through paperwork, same protection, different disguise.

Page: https://tryals.app/practice/business-i/international-trade/sort-each-trade-barrier-by-its-type

### 5. Match each group to how a new import tariff affects it.

**Answer:**

- Domestic producers → Gain: shielded prices and market share
- Consumers → Lose: higher prices on all units
- The treasury → Gains revenue on remaining imports
- The economy overall → Loses the deadweight triangles

**Why:** A tariff redistributes from many consumers to few producers and the state, and burns a margin of value in the process.

Page: https://tryals.app/practice/business-i/international-trade/match-each-group-to-how-a-new-import-tariff-affects-it

### 6. A country is _less productive than its neighbor at everything_. What does trade theory conclude?

A. It should close its borders until productivity catches up
B. It gains by specializing where its opportunity cost is lowest
C. It should subsidize every export industry equally
D. It cannot trade profitably with that neighbor

**Answer:** B. It gains by specializing where its opportunity cost is lowest

**Why:** Comparative advantage is guaranteed to exist somewhere: being uniformly worse still leaves you *relatively* least-bad at something. Both sides expand consumption by trading along those lines.

Page: https://tryals.app/practice/business-i/international-trade/a-country-is-less-productive-than-its-neighbor-at-everything-what

### 7. A brilliant surgeon types faster than her receptionist and still hires one. Which trade principle is that, in miniature?

A. Nothing economic; hiring a receptionist is a status decision
B. Division of labour, which is unrelated to comparative advantage
C. Absolute advantage, since the receptionist must be better at something
D. Comparative advantage, since her hour is worth more in surgery

**Answer:** D. Comparative advantage, since her hour is worth more in surgery

**Why:** The comparison that matters is what each forgoes, not what each can do, an hour of the surgeon's typing costs an operation. Ricardo's result scales the same way for countries, which is why 'they are better at everything' is never an argument against trade.

Page: https://tryals.app/practice/business-i/international-trade/a-brilliant-surgeon-types-faster-than-her-receptionist-and-still