GED Prep: Geography and Economics (Maps, Supply/Demand, Trade, GDP)

GED – Geography and Economics (Maps, Supply/Demand, Trade, GDP)

GED Study Guide: Geography and Economics (Maps, Supply/Demand, Trade, GDP)

What This Is

This section tests your ability to interpret maps, understand economic principles (supply/demand, trade, GDP), and apply these concepts to real-world scenarios. On the GED, you’ll see questions about reading coordinate grids, analyzing trade benefits, calculating GDP growth, and explaining how supply and demand affect prices. Example test question: "A country’s GDP grew from $500 billion to $525 billion in one year. What was the percentage increase?" (Answer: 5%—you’ll learn how to calculate this below.)

Key Terms & Rules

Geography (Maps & Coordinates)

• Latitude & Longitude: Latitude (horizontal lines, measured in degrees North/South of the Equator) and longitude (vertical lines, measured East/West of the Prime Meridian). Example: New York is at 40°N, 74°W.
• Coordinate Grid: A map divided into quadrants using (x, y) or (longitude, latitude) pairs. Rule: Always read x (horizontal) first, then y (vertical).
• Scale: The ratio of map distance to real-world distance (e.g., 1 inch = 100 miles). Use a ruler to measure distances on the GED’s provided maps.
• Topographic Map: Shows elevation with contour lines. Closer lines = steeper terrain; wider lines = flatter land.

Economics (Supply, Demand, Trade, GDP)

• Supply & Demand: The relationship between how much of a good is available (supply) and how much people want it (demand). High demand + low supply = higher prices; low demand + high supply = lower prices.
• Equilibrium Price: The price where supply equals demand. On a graph, it’s where the supply curve (upward-sloping) and demand curve (downward-sloping) intersect.
• GDP (Gross Domestic Product): The total value of all goods/services produced in a country in a year. Formula: GDP = C (Consumer Spending) + I (Investment) + G (Government Spending) + (Exports – Imports).
• GDP Growth Rate: Measures economic growth. Formula: [(New GDP – Old GDP) / Old GDP] × 100%. Example: If GDP rises from $100B to $105B, growth = 5%.
• Trade Surplus vs. Deficit:
• Surplus: Exports > Imports (country earns more from trade).
• Deficit: Imports > Exports (country spends more on trade).
• Comparative Advantage: When a country produces a good at a lower opportunity cost than another country. Key for trade questions!
• Opportunity Cost: What you give up to get something else. Example: If a country spends $1B on military instead of education, the opportunity cost is the lost education benefits.

Step-by-Step / Process Flow

1. Solving a GDP Growth Question

Question: A country’s GDP was $800 billion last year and $840 billion this year. What is the GDP growth rate? Steps:
1. Identify the formula: [(New GDP – Old GDP) / Old GDP] × 100%.
2. Plug in numbers: [(840 – 800) / 800] × 100%.
3. Calculate: (40 / 800) × 100% = 5%.

2. Reading a Supply/Demand Graph

Question: If the price of coffee rises, what happens to the quantity demanded? Steps:
1. Locate the demand curve (downward-sloping line).
2. Move up the curve (higher price = lower quantity demanded).
3. Answer: Quantity demanded decreases.

3. Interpreting a Trade Scenario

Question: Country A can produce 10 cars or 20 computers. Country B can produce 5 cars or 15 computers. Which country has a comparative advantage in cars? Steps:
1. Calculate opportunity cost for Country A: - 1 car = 2 computers (20 computers / 10 cars). - 1 computer = 0.5 cars (10 cars / 20 computers).
2. Calculate opportunity cost for Country B: - 1 car = 3 computers (15 computers / 5 cars). - 1 computer = 0.33 cars (5 cars / 15 computers).
3. Compare: Country A has a lower opportunity cost for cars (2 vs. 3 computers), so it has the comparative advantage.

4. Reading a Topographic Map

Question: Which side of the mountain is steeper: the east or west side? Steps:
1. Look at contour lines (closer = steeper).
2. Compare spacing on both sides.
3. Answer: The side with closer lines is steeper.

Common Mistakes

Exam Insights

1. Most-Tested Concepts:
2. GDP growth rate calculations (always use the formula).
3. Supply/demand shifts (e.g., "What happens to price if supply decreases?").
4. Comparative advantage (look for opportunity cost questions).

5. Map scales and coordinates (practice measuring distances).

6. Tricky Distractors:

7. GDP vs. GDP per capita: GDP per capita = GDP / population (measures average wealth).
8. Absolute vs. Comparative Advantage: Absolute = who produces more; Comparative = who produces cheaper.

9. Trade surplus vs. deficit: Surplus = exports > imports; deficit = imports > exports.

10. Calculator Tip:

11. Use the GED calculator for GDP growth and percentage changes. Example: To find 5% of 800, enter 800 × 0.05 = 40.

12. Real-World Trap:

13. The GED may ask about unintended consequences of economic policies (e.g., "A tariff on imports might protect local jobs but increase prices for consumers").

Quick Check Questions

1. Geography (Map Scale)

A map scale shows 1 inch = 50 miles. If two cities are 3 inches apart on the map, how far are they in real life? A) 50 miles B) 100 miles C) 150 miles D) 200 miles ? Answer: C) 150 miles (3 inches × 50 miles/inch = 150 miles).

2. Economics (GDP Growth)

A country’s GDP was $200 billion in 2022 and $210 billion in 2023. What was the GDP growth rate? A) 2% B) 5% C) 10% D) 20% ? Answer: B) 5% ([(210 – 200) / 200] × 100% = 5%).

3. Supply & Demand

If a new study shows that eating apples reduces heart disease, what happens to the demand for apples? A) Demand decreases B) Demand increases C) Supply decreases D) Price decreases ? Answer: B) Demand increases (More people want apples, shifting the demand curve right).

Last-Minute Cram Sheet

1. GDP Growth Formula: [(New – Old) / Old] × 100% Don’t forget to multiply by 100!
2. Supply Curve: Upward-sloping (? price =-quantity supplied).
3. Demand Curve: Downward-sloping (? price =-quantity demanded).
4. Comparative Advantage: Lower opportunity cost = better for trade.
5. Latitude = Horizontal (N/S), Longitude = Vertical (E/W).
6. Map Scale: 1 inch = X miles-multiply by inches to get real distance.
7. Trade Surplus: Exports > Imports; Deficit: Imports > Exports.
8. GDP = C + I + G + (Exports – Imports).
9. GDP-GDP per capita (per capita = GDP / population).
10. Opportunity cost is what you give up, not what you gain.