The correct option is B. quotas. Detailed Explanation

1. Definition of Quotas: A quota is a trade control method that limits the quantity of a specific commodity that can be imported or exported during a given time period. This is often used by governments to protect domestic industries from foreign competition, manage supply and demand, or achieve other economic objectives.
2. How Quotas Work: When a government imposes a quota, it sets a maximum limit on the amount of a particular good that can be imported. For example, if a country sets a quota of 10,000 tons for imported sugar, no more than that amount can be brought into the country during the specified period. This can lead to higher prices for domestic producers, as the limited supply of imports can create scarcity.
3. Purpose of Quotas: Quotas are used for several reasons:
4. Protecting Domestic Industries: By limiting imports, quotas help domestic producers compete against foreign companies that may have lower production costs.
5. Controlling Supply: Quotas can help stabilize the market by preventing an oversupply of goods, which can lead to price drops.
6. Political Reasons: Sometimes quotas are used as a tool in trade negotiations or to respond to unfair trade practices.

Why Other Options Are Incorrect

• A. Tariffs: Tariffs are taxes imposed on imported goods. While they can increase the cost of imports and thus reduce the quantity imported, they do not limit the quantity directly. Instead, they make imports more expensive, which can lead to a decrease in demand but does not set a specific cap on the amount that can be imported.
• C. Exchange Control: Exchange control refers to government restrictions on the purchase and sale of foreign currencies. This is not directly related to limiting the quantity of a specific commodity but rather controls the flow of currency in and out of a country. It can affect trade indirectly but does not impose limits on the quantity of goods.
• D. Devaluation: Devaluation is the reduction of the value of a country's currency relative to other currencies. This can make exports cheaper and imports more expensive, potentially affecting the quantity of imports, but it does not impose a direct limit on the amount of a commodity that can be imported.

Example Calculation To illustrate how quotas work, consider a hypothetical scenario where a country has a quota of 5,000 units for imported bicycles. If the domestic demand for bicycles is 20,000 units, and domestic producers can only supply 15,000 units, the quota will create a shortage of 5,000 units. This shortage can lead to higher prices for bicycles in the domestic market, benefiting local manufacturers. Common Pitfalls

• Confusing Quotas with Tariffs: Students often confuse quotas with tariffs. Remember, quotas limit quantity, while tariffs impose a tax on imports.
• Overlooking the Purpose of Quotas: It's important to understand that quotas are not just about limiting imports; they serve specific economic and political purposes.

Revision Summary

• Quotas limit the quantity of a commodity that can be imported or exported.
• They are used to protect domestic industries and control market supply.
• Tariffs impose taxes on imports but do not limit quantity.
• Exchange control and devaluation are related to currency management, not direct limits on commodity imports.

Understanding these concepts will help clarify the role of quotas in international trade and their impact on domestic economies.