#AP Microeconomics: International Trade & Public Policy 🌎

Hey! Let's get you prepped for the AP Microeconomics exam. This guide focuses on international trade, specifically quotas and tariffs, and how they impact markets. We'll break it down so you're feeling confident and ready to ace this!

#Introduction to International Trade and Public Policy

International trade is all about countries buying and selling goods and services with each other. It's a big deal because it:

• Expands markets for businesses.
• Increases variety of goods for consumers.
• Boosts competition, which usually means lower prices. 💡

Public policy refers to the laws and regulations that governments use to manage the economy. When it comes to international trade, policies like quotas and tariffs are super important. Think of them as tools that governments use to influence how much trade happens. For example, the United States trades a lot with China, Canada, and Mexico because it's often cheaper to import certain goods than to make them at home.

#Trade Quotas

A quota is a limit on the quantity of a good that can be imported into a country. It's like saying, "We'll only allow this much of that product to come in." Governments use quotas to protect domestic industries from foreign competition. It's a way to give local businesses a leg up, but it can also lead to higher prices for consumers.

#Understanding Quota Graphs

Let's look at a typical quota graph:

• P_E and Q_E: These are the equilibrium price and quantity before the quota is introduced. It's where supply and demand meet naturally.
• Q_Q: This is the quota limit. It's the maximum quantity of the good that can be imported.
• P_Q: This is the new price after the quota is in place. Notice it's higher than P_E.
• S_q: This is the supply curve after the quota. It's perfectly inelastic because the quantity is fixed by the quota.
• Consumer Surplus: The green triangle represents the benefit consumers get from buying the good at a price lower than they'd be willing to pay.
• Producer Surplus: The yellow area is the benefit producers get from selling the good at a price higher than they'd be willing to sell for.
• Deadweight Loss: The orange triangle shows the loss of total surplus due to the quota. It's inefficiency created by the quota.

#Tariffs

A tariff is a tax on imported goods. Think of it as a fee that makes foreign products more expensive. Governments use tariffs to:

• Protect domestic industries.
• Raise revenue.

#Understanding Tariff Graphs

Tariff graphs show how prices and quantities change when a tariff is imposed. Let's break it down step-by-step:

#Before Trade

• P_E and Q_E: This is the market equilibrium before any international trade. The market functions like normal.

#With Free Trade

• P_W: This is the world price, the price at which goods are traded internationally. It's usually lower than the domestic equilibrium price.
• Q1: The quantity produced domestically at the world price.
• Q4: The total quantity demanded at the world price.
• Imports: The difference between Q4 and Q1 is the quantity of goods imported to meet demand.
• Consumer Surplus: The large triangle above the world price, showing the benefit consumers get from lower prices.
• Producer Surplus: The small triangle below the world price, showing the benefit producers get from selling at that price.

#After a Tariff

• P_T: This is the new price after the tariff is imposed. It's higher than the world price but still lower than the original domestic price.
• Q3: The new quantity supplied domestically after the tariff.
• Q4: The new quantity demanded after the tariff.
• Imports: The difference between Q4 and Q3 is the new quantity of imports.
• Consumer Surplus: Decreases due to higher prices.
• Producer Surplus: Increases because domestic producers can sell at a higher price.
• Tariff Revenue: The rectangle representing the tax revenue collected by the government.
• Deadweight Loss: The two small triangles showing the loss of total surplus due to the tariff. It's the inefficiency created by the tariff.

#Final Exam Focus 🎯

Alright, let's focus on what's most likely to show up on the exam:

• Graphing: Be super comfortable drawing and interpreting graphs for both quotas and tariffs. Pay close attention to the areas of consumer surplus, producer surplus, deadweight loss, and tariff revenue.
• Impacts: Understand how quotas and tariffs affect prices, quantities, consumer surplus, producer surplus, and overall market efficiency.
• Policy Analysis: Be ready to analyze the pros and cons of quotas and tariffs. Think about who benefits and who loses from these policies.
• Real-World Examples: Connect these concepts to real-world trade policies. Knowing examples will help you understand the practical implications.

#Practice Questions

Practice Question

#Multiple Choice Questions

1. A tariff on imported goods will most likely result in which of the following? (A) A decrease in domestic production and an increase in imports (B) An increase in domestic production and a decrease in imports (C) A decrease in both domestic production and imports (D) An increase in both domestic production and imports (E) No change in either domestic production or imports

2. Which of the following is true about the impact of a quota on imported goods? (A) It leads to a decrease in price and an increase in quantity. (B) It leads to an increase in price and a decrease in quantity. (C) It leads to a decrease in both price and quantity. (D) It leads to an increase in both price and quantity. (E) It has no impact on price or quantity.

3. Deadweight loss from a tariff represents: (A) Revenue collected by the government. (B) Increased producer surplus. (C) Reduced consumer surplus. (D) A loss of total surplus. (E) A gain in total surplus.

#Free Response Question

Consider the market for widgets. The domestic demand and supply curves are given by:

• Domestic Demand: $Q_D = 100 - 2P$
• Domestic Supply: $Q_S = 2P - 20$

The world price of widgets is $20. (a) Calculate the equilibrium price and quantity in the domestic market if there is no international trade.$

(b) Calculate the quantity of widgets imported if the market is open to international trade at the world price of20. (c) Suppose the government imposes a tariff of $10 per widget. Calculate the new quantity of widgets imported.$

(d) Calculate the change in consumer surplus, producer surplus, and government revenue as a result of the tariff.

(e) Calculate the deadweight loss caused by the tariff.

#FRQ Scoring Breakdown

(a) Equilibrium Price and Quantity (3 points)

• SetQ_D = Q_S$:$100 - 2P = 2P - 20$* Solve for P:$4P = 120$,$P = 30$(1 point)$
• Substitute P into either equation to find Q:Q = 100 - 2(30) = 40$(1 point)$
• Equilibrium price =30, equilibrium quantity = 40 (1 point)

(b) Quantity of Imports with Free Trade (2 points)

• Find domestic demand at P = 20: $Q_D = 100 - 2(20) = 60$ (1 point)
• Find domestic supply at P = 20: $Q_S = 2(20) - 20 = 20$ (1 point)
• Imports = $Q_D - Q_S = 60 - 20 = 40$ (1 point)

(c) Quantity of Imports with Tariff (3 points)

• New price with tariff: $P_T = 20 + 10 = 30$ (1 point)
• Find new domestic demand at P = 30: $Q_D = 100 - 2(30) = 40$ (1 point)
• Find new domestic supply at P = 30: $Q_S = 2(30) - 20 = 40$ (1 point)
• Imports = $Q_D - Q_S = 40 - 40 = 0$ (1 point)

(d) Change in Surpluses and Government Revenue (4 points)

• Change in consumer surplus: $CS_{before} = \frac{1}{2} * (60 - 20) * (100 - 20) = 1600$, $CS_{after} = \frac{1}{2} * (60 - 30) * (100 - 30) = 1225$, $\Delta CS = -375$ (1 point)
• Change in producer surplus: $PS_{before} = \frac{1}{2} * (20 - 10) * 20 = 100$, $PS_{after} = \frac{1}{2} * (30 - 10) * 40 = 400$, $\Delta PS = 300$ (1 point)
• Government revenue: $Tariff * Imports = 10 * 0 = 0$ (1 point)

(e) Deadweight Loss (2 points)

• $DWL = \frac{1}{2} * (40-20) * (30-20) = 100$ (2 points)

#Answers to MCQs:

1. (B)
2. (B)
3. (D)

Remember, you've got this! Focus on understanding the concepts, practice drawing the graphs, and you'll be well-prepared for the exam. Good luck! 🎉